12255535021 has 4 divisors (see below), whose sum is σ = 12900563200. Its totient is φ = 11610506844.

The previous prime is 12255535013. The next prime is 12255535051. The reversal of 12255535021 is 12053555221.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12053555221 = 1061 ⋅11360561.

It is a cyclic number.

It is not a de Polignac number, because 12255535021 - 2³ = 12255535013 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 (12255535051) 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, 322514061 + ... + 322514098.

It is an arithmetic number, because the mean of its divisors is an integer number (3225140800).

Almost surely, 2^12255535021 is an apocalyptic number.

It is an amenable number.

12255535021 is a deficient number, since it is larger than the sum of its proper divisors (645028179).

12255535021 is an equidigital number, since it uses as much as digits as its factorization.

12255535021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645028178.

The product of its (nonzero) digits is 15000, while the sum is 31.

The spelling of 12255535021 in words is "twelve billion, two hundred fifty-five million, five hundred thirty-five thousand, twenty-one".