12550451621 has 4 divisors (see below), whose sum is σ = 12763171200. Its totient is φ = 12337732044.

The previous prime is 12550451611. The next prime is 12550451623. The reversal of 12550451621 is 12615405521.

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 a de Polignac number, because none of the positive numbers 2^k-12550451621 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 (12550451623) 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, 106359701 + ... + 106359818.

It is an arithmetic number, because the mean of its divisors is an integer number (3190792800).

Almost surely, 2^12550451621 is an apocalyptic number.

It is an amenable number.

12550451621 is a deficient number, since it is larger than the sum of its proper divisors (212719579).

12550451621 is an equidigital number, since it uses as much as digits as its factorization.

12550451621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212719578.

The product of its (nonzero) digits is 12000, while the sum is 32.

The spelling of 12550451621 in words is "twelve billion, five hundred fifty million, four hundred fifty-one thousand, six hundred twenty-one".