12220644405 has 16 divisors (see below), whose sum is σ = 19586355264. Its totient is φ = 6506568960.

The previous prime is 12220644389. The next prime is 12220644421. The reversal of 12220644405 is 50444602221.

It is an interprime number because it is at equal distance from previous prime (12220644389) and next prime (12220644421).

It is not a de Polignac number, because 12220644405 - 2⁴ = 12220644389 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 685156 + ... + 702765.

It is an arithmetic number, because the mean of its divisors is an integer number (1224147204).

Almost surely, 2^12220644405 is an apocalyptic number.

12220644405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12220644405 is a deficient number, since it is larger than the sum of its proper divisors (7365710859).

12220644405 is a wasteful number, since it uses less digits than its factorization.

12220644405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1388516.

The product of its (nonzero) digits is 15360, while the sum is 30.

The spelling of 12220644405 in words is "twelve billion, two hundred twenty million, six hundred forty-four thousand, four hundred five".