21355324504 has 16 divisors (see below), whose sum is σ = 40415452200. Its totient is φ = 10577870592.

The previous prime is 21355324489. The next prime is 21355324513. The reversal of 21355324504 is 40542355312.

It is a super-2 number, since 2×21355324504² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21355324504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12473049 + ... + 12474760.

Almost surely, 2^21355324504 is an apocalyptic number.

It is an amenable number.

21355324504 is a deficient number, since it is larger than the sum of its proper divisors (19060127696).

21355324504 is a wasteful number, since it uses less digits than its factorization.

21355324504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24947922 (or 24947918 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 34.

Adding to 21355324504 its reverse (40542355312), we get a palindrome (61897679816).

The spelling of 21355324504 in words is "twenty-one billion, three hundred fifty-five million, three hundred twenty-four thousand, five hundred four".