12355624221 has 4 divisors (see below), whose sum is σ = 16474165632. Its totient is φ = 8237082812.

The previous prime is 12355624207. The next prime is 12355624223. The reversal of 12355624221 is 12242655321.

It is a happy number.

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 12355624221 - 2¹⁰ = 12355623197 is a prime.

It is a super-2 number, since 2×12355624221² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12355624223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2059270701 + ... + 2059270706.

It is an arithmetic number, because the mean of its divisors is an integer number (4118541408).

Almost surely, 2^12355624221 is an apocalyptic number.

It is an amenable number.

12355624221 is a deficient number, since it is larger than the sum of its proper divisors (4118541411).

12355624221 is an equidigital number, since it uses as much as digits as its factorization.

12355624221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4118541410.

The product of its digits is 28800, while the sum is 33.

The spelling of 12355624221 in words is "twelve billion, three hundred fifty-five million, six hundred twenty-four thousand, two hundred twenty-one".