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21425101 = 31168891
BaseRepresentation
bin101000110111…
…0101111001101
31111022111201021
41101232233031
520441100401
62043114141
7350052565
oct121565715
944274637
1021425101
1111103aa5
127212951
134591c99
142bb9da5
151d332a1
hex146ebcd

21425101 has 4 divisors (see below), whose sum is σ = 21494304. Its totient is φ = 21355900.

The previous prime is 21425099. The next prime is 21425147. The reversal of 21425101 is 10152412.

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 21425101 - 21 = 21425099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21425161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34135 + ... + 34756.

It is an arithmetic number, because the mean of its divisors is an integer number (5373576).

Almost surely, 221425101 is an apocalyptic number.

It is an amenable number.

21425101 is a deficient number, since it is larger than the sum of its proper divisors (69203).

21425101 is an equidigital number, since it uses as much as digits as its factorization.

21425101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69202.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 21425101 is about 4628.7256345564. The cubic root of 21425101 is about 277.7416167980.

Adding to 21425101 its reverse (10152412), we get a palindrome (31577513).

The spelling of 21425101 in words is "twenty-one million, four hundred twenty-five thousand, one hundred one".

Divisors: 1 311 68891 21425101