21224512525613 has 4 divisors (see below), whose sum is σ = 21541296294720. Its totient is φ = 20907728756508.

The previous prime is 21224512525483. The next prime is 21224512525793. The reversal of 21224512525613 is 31652521542212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21224512525613 - 2²⁴ = 21224495748397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21224512525213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158391884453 + ... + 158391884586.

It is an arithmetic number, because the mean of its divisors is an integer number (5385324073680).

Almost surely, 2^{21224512525613} is an apocalyptic number.

It is an amenable number.

21224512525613 is a deficient number, since it is larger than the sum of its proper divisors (316783769107).

21224512525613 is an equidigital number, since it uses as much as digits as its factorization.

21224512525613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316783769106.

The product of its digits is 288000, while the sum is 41.

The spelling of 21224512525613 in words is "twenty-one trillion, two hundred twenty-four billion, five hundred twelve million, five hundred twenty-five thousand, six hundred thirteen".