22521556521 has 16 divisors (see below), whose sum is σ = 33514897920. Its totient is φ = 14947038000.

The previous prime is 22521556517. The next prime is 22521556583. The reversal of 22521556521 is 12565512522.

22521556521 is a `hidden beast` number, since 2 + 2 + 52 + 1 + 556 + 52 + 1 = 666.

It is not a de Polignac number, because 22521556521 - 2² = 22521556517 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (22521556511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1864230 + ... + 1876271.

It is an arithmetic number, because the mean of its divisors is an integer number (2094681120).

Almost surely, 2^22521556521 is an apocalyptic number.

It is an amenable number.

22521556521 is a deficient number, since it is larger than the sum of its proper divisors (10993341399).

22521556521 is a wasteful number, since it uses less digits than its factorization.

22521556521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3740733 (or 3740727 counting only the distinct ones).

The product of its digits is 60000, while the sum is 36.

The spelling of 22521556521 in words is "twenty-two billion, five hundred twenty-one million, five hundred fifty-six thousand, five hundred twenty-one".