23221242521 has 8 divisors (see below), whose sum is σ = 24472915200. Its totient is φ = 21972520080.

The previous prime is 23221242511. The next prime is 23221242533. The reversal of 23221242521 is 12524212232.

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

It is a cyclic number.

It is not a de Polignac number, because 23221242521 - 2²⁶ = 23154133657 is a prime.

It is a super-2 number, since 2×23221242521² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23221242511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 721385 + ... + 752886.

It is an arithmetic number, because the mean of its divisors is an integer number (3059114400).

Almost surely, 2^23221242521 is an apocalyptic number.

It is an amenable number.

23221242521 is a deficient number, since it is larger than the sum of its proper divisors (1251672679).

23221242521 is a wasteful number, since it uses less digits than its factorization.

23221242521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1475119.

The product of its digits is 3840, while the sum is 26.

Adding to 23221242521 its reverse (12524212232), we get a palindrome (35745454753).

The spelling of 23221242521 in words is "twenty-three billion, two hundred twenty-one million, two hundred forty-two thousand, five hundred twenty-one".