21024551136 has 48 divisors (see below), whose sum is σ = 55432629504. Its totient is φ = 6977303424.

The previous prime is 21024551123. The next prime is 21024551179. The reversal of 21024551136 is 63115542012.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 460600 + ... + 504183.

It is an arithmetic number, because the mean of its divisors is an integer number (1154846448).

Almost surely, 2^21024551136 is an apocalyptic number.

It is an amenable number.

21024551136 is an abundant number, since it is smaller than the sum of its proper divisors (34408078368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21024551136 is a wasteful number, since it uses less digits than its factorization.

21024551136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965023 (or 965015 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The spelling of 21024551136 in words is "twenty-one billion, twenty-four million, five hundred fifty-one thousand, one hundred thirty-six".