Base | Representation |
---|---|
bin | 1010000011010… |
… | …1011111001001 |
3 | 2221100001120001 |
4 | 2200311133021 |
5 | 41243141441 |
6 | 4103403001 |
7 | 1021241431 |
oct | 240653711 |
9 | 87301501 |
10 | 42162121 |
11 | 21888031 |
12 | 12153461 |
13 | 8972a01 |
14 | 58572c1 |
15 | 3a7c731 |
hex | 28357c9 |
42162121 has 4 divisors (see below), whose sum is σ = 44381200. Its totient is φ = 39943044.
The previous prime is 42162119. The next prime is 42162179. The reversal of 42162121 is 12126124.
42162121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.
It is a cyclic number.
It is not a de Polignac number, because 42162121 - 21 = 42162119 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 2219059 = 42162121 / (4 + 2 + 1 + 6 + 2 + 1 + 2 + 1).
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (42162101) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1109511 + ... + 1109548.
It is an arithmetic number, because the mean of its divisors is an integer number (11095300).
Almost surely, 242162121 is an apocalyptic number.
It is an amenable number.
42162121 is a deficient number, since it is larger than the sum of its proper divisors (2219079).
42162121 is a wasteful number, since it uses less digits than its factorization.
42162121 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2219078.
The product of its digits is 192, while the sum is 19.
The square root of 42162121 is about 6493.2365581426. The cubic root of 42162121 is about 348.0493417728.
Adding to 42162121 its reverse (12126124), we get a palindrome (54288245).
The spelling of 42162121 in words is "forty-two million, one hundred sixty-two thousand, one hundred twenty-one".
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