22521012521 has 8 divisors (see below), whose sum is σ = 25988187264. Its totient is φ = 19116309600.

The previous prime is 22521012509. The next prime is 22521012551. The reversal of 22521012521 is 12521012522.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22521012521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22521012551) 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, 15617180 + ... + 15618621.

It is an arithmetic number, because the mean of its divisors is an integer number (3248523408).

Almost surely, 2^22521012521 is an apocalyptic number.

It is an amenable number.

22521012521 is a deficient number, since it is larger than the sum of its proper divisors (3467174743).

22521012521 is a wasteful number, since it uses less digits than its factorization.

22521012521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31235911.

The product of its (nonzero) digits is 800, while the sum is 23.

Subtracting from 22521012521 its reverse (12521012522), we obtain a palindrome (9999999999).

The spelling of 22521012521 in words is "twenty-two billion, five hundred twenty-one million, twelve thousand, five hundred twenty-one".