22501201521 has 16 divisors (see below), whose sum is σ = 30622276800. Its totient is φ = 14693614848.

The previous prime is 22501201487. The next prime is 22501201531. The reversal of 22501201521 is 12510210522.

It is not a de Polignac number, because 22501201521 - 2¹³ = 22501193329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22501201531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 365236 + ... + 422373.

It is an arithmetic number, because the mean of its divisors is an integer number (1913892300).

Almost surely, 2^22501201521 is an apocalyptic number.

It is an amenable number.

22501201521 is a deficient number, since it is larger than the sum of its proper divisors (8121075279).

22501201521 is a wasteful number, since it uses less digits than its factorization.

22501201521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 787808.

The product of its (nonzero) digits is 400, while the sum is 21.

Subtracting from 22501201521 its reverse (12510210522), we obtain a palindrome (9990990999).

The spelling of 22501201521 in words is "twenty-two billion, five hundred one million, two hundred one thousand, five hundred twenty-one".