21102402604 has 12 divisors (see below), whose sum is σ = 36964349128. Its totient is φ = 10541160000.

The previous prime is 21102402593. The next prime is 21102402667. The reversal of 21102402604 is 40620420112.

It is a happy number.

It is a super-2 number, since 2×21102402604² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2505597 + ... + 2514004.

Almost surely, 2^21102402604 is an apocalyptic number.

It is an amenable number.

21102402604 is a deficient number, since it is larger than the sum of its proper divisors (15861946524).

21102402604 is a wasteful number, since it uses less digits than its factorization.

21102402604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5020656 (or 5020654 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21102402604 its reverse (40620420112), we get a palindrome (61722822716).

The spelling of 21102402604 in words is "twenty-one billion, one hundred two million, four hundred two thousand, six hundred four".