21500462552 has 8 divisors (see below), whose sum is σ = 40313367300. Its totient is φ = 10750231272.

The previous prime is 21500462527. The next prime is 21500462617. The reversal of 21500462552 is 25526400512.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1343778902 + ... + 1343778917.

Almost surely, 2^21500462552 is an apocalyptic number.

It is an amenable number.

21500462552 is a deficient number, since it is larger than the sum of its proper divisors (18812904748).

21500462552 is a wasteful number, since it uses less digits than its factorization.

21500462552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2687557825 (or 2687557821 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 32.

The spelling of 21500462552 in words is "twenty-one billion, five hundred million, four hundred sixty-two thousand, five hundred fifty-two".