21533053504 has 28 divisors (see below), whose sum is σ = 42748126848. Its totient is φ = 10761872000.

The previous prime is 21533053489. The next prime is 21533053543. The reversal of 21533053504 is 40535033512.

It is a super-2 number, since 2×21533053504² (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, 78909 + ... + 222019.

It is an arithmetic number, because the mean of its divisors is an integer number (1526718816).

Almost surely, 2^21533053504 is an apocalyptic number.

It is an amenable number.

21533053504 is a deficient number, since it is larger than the sum of its proper divisors (21215073344).

21533053504 is a wasteful number, since it uses less digits than its factorization.

21533053504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145474 (or 145464 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 31.

The spelling of 21533053504 in words is "twenty-one billion, five hundred thirty-three million, fifty-three thousand, five hundred four".