Base | Representation |
---|---|
bin | 101000101111… |
… | …1011011110101 |
3 | 1111012022201210 |
4 | 1101133123311 |
5 | 20432044141 |
6 | 2041512033 |
7 | 346402053 |
oct | 121373365 |
9 | 44168653 |
10 | 21362421 |
11 | 110709a3 |
12 | 71a2619 |
13 | 456c5b2 |
14 | 2ba11d3 |
15 | 1d1e916 |
hex | 145f6f5 |
21362421 has 8 divisors (see below), whose sum is σ = 30158784. Its totient is φ = 13403840.
The previous prime is 21362417. The next prime is 21362447. The reversal of 21362421 is 12426312.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 21362421 - 22 = 21362417 is a prime.
It is a super-3 number, since 3×213624213 (a number of 23 digits) contains 333 as substring.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21362521) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 209385 + ... + 209486.
It is an arithmetic number, because the mean of its divisors is an integer number (3769848).
Almost surely, 221362421 is an apocalyptic number.
It is an amenable number.
21362421 is a deficient number, since it is larger than the sum of its proper divisors (8796363).
21362421 is a wasteful number, since it uses less digits than its factorization.
21362421 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 418891.
The product of its digits is 576, while the sum is 21.
The square root of 21362421 is about 4621.9499131860. The cubic root of 21362421 is about 277.4705041290.
Adding to 21362421 its reverse (12426312), we get a palindrome (33788733).
The spelling of 21362421 in words is "twenty-one million, three hundred sixty-two thousand, four hundred twenty-one".
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