21204562013 has 16 divisors (see below), whose sum is σ = 21713552640. Its totient is φ = 20702304000.

The previous prime is 21204561919. The next prime is 21204562019. The reversal of 21204562013 is 31026540212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21204562013 - 2¹⁴ = 21204545629 is a prime.

It is a super-2 number, since 2×21204562013² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21204562019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3610043 + ... + 3615911.

It is an arithmetic number, because the mean of its divisors is an integer number (1357097040).

Almost surely, 2^21204562013 is an apocalyptic number.

It is an amenable number.

21204562013 is a deficient number, since it is larger than the sum of its proper divisors (508990627).

21204562013 is a wasteful number, since it uses less digits than its factorization.

21204562013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6428.

The product of its (nonzero) digits is 2880, while the sum is 26.

The spelling of 21204562013 in words is "twenty-one billion, two hundred four million, five hundred sixty-two thousand, thirteen".