21525041564 has 24 divisors (see below), whose sum is σ = 40570492368. Its totient is φ = 9933638400.

The previous prime is 21525041563. The next prime is 21525041569. The reversal of 21525041564 is 46514052512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21525041561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 853739 + ... + 878589.

It is an arithmetic number, because the mean of its divisors is an integer number (1690437182).

Almost surely, 2^21525041564 is an apocalyptic number.

It is an amenable number.

21525041564 is a deficient number, since it is larger than the sum of its proper divisors (19045450804).

21525041564 is a wasteful number, since it uses less digits than its factorization.

21525041564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41525 (or 41523 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 35.

The spelling of 21525041564 in words is "twenty-one billion, five hundred twenty-five million, forty-one thousand, five hundred sixty-four".