21153613504 has 28 divisors (see below), whose sum is σ = 41984803000. Its totient is φ = 10574765568.

The previous prime is 21153613493. The next prime is 21153613511. The reversal of 21153613504 is 40531635112.

It is a super-2 number, since 2×21153613504² (a number of 21 digits) contains 22 as substring.

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, 335047 + ... + 393145.

It is an arithmetic number, because the mean of its divisors is an integer number (1499457250).

Almost surely, 2^21153613504 is an apocalyptic number.

It is an amenable number.

21153613504 is a deficient number, since it is larger than the sum of its proper divisors (20831189496).

21153613504 is an equidigital number, since it uses as much as digits as its factorization.

21153613504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63800 (or 63790 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The spelling of 21153613504 in words is "twenty-one billion, one hundred fifty-three million, six hundred thirteen thousand, five hundred four".