21525350052 has 12 divisors (see below), whose sum is σ = 50225816816. Its totient is φ = 7175116680.

The previous prime is 21525349997. The next prime is 21525350089. The reversal of 21525350052 is 25005352512.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×21525350052² (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, 896889574 + ... + 896889597.

Almost surely, 2^21525350052 is an apocalyptic number.

It is an amenable number.

21525350052 is an abundant number, since it is smaller than the sum of its proper divisors (28700466764).

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

21525350052 is a wasteful number, since it uses less digits than its factorization.

21525350052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1793779178 (or 1793779176 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 30.

The spelling of 21525350052 in words is "twenty-one billion, five hundred twenty-five million, three hundred fifty thousand, fifty-two".