12520710921 has 4 divisors (see below), whose sum is σ = 16694281232. Its totient is φ = 8347140612.

The previous prime is 12520710893. The next prime is 12520710947. The reversal of 12520710921 is 12901702521.

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 not a de Polignac number, because 12520710921 - 2⁶ = 12520710857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12520710221) 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, 2086785151 + ... + 2086785156.

It is an arithmetic number, because the mean of its divisors is an integer number (4173570308).

Almost surely, 2^12520710921 is an apocalyptic number.

It is an amenable number.

12520710921 is a deficient number, since it is larger than the sum of its proper divisors (4173570311).

12520710921 is an equidigital number, since it uses as much as digits as its factorization.

12520710921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4173570310.

The product of its (nonzero) digits is 2520, while the sum is 30.

The spelling of 12520710921 in words is "twelve billion, five hundred twenty million, seven hundred ten thousand, nine hundred twenty-one".