12115506621 has 4 divisors (see below), whose sum is σ = 16154008832. Its totient is φ = 8077004412.

The previous prime is 12115506587. The next prime is 12115506629. The reversal of 12115506621 is 12660551121.

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 12115506621 - 2⁷ = 12115506493 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 (12115506629) 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, 2019251101 + ... + 2019251106.

It is an arithmetic number, because the mean of its divisors is an integer number (4038502208).

Almost surely, 2^12115506621 is an apocalyptic number.

It is an amenable number.

12115506621 is a deficient number, since it is larger than the sum of its proper divisors (4038502211).

12115506621 is an equidigital number, since it uses as much as digits as its factorization.

12115506621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4038502210.

The product of its (nonzero) digits is 3600, while the sum is 30.

The spelling of 12115506621 in words is "twelve billion, one hundred fifteen million, five hundred six thousand, six hundred twenty-one".