12225478820 has 24 divisors (see below), whose sum is σ = 25827246144. Its totient is φ = 4860907616.

The previous prime is 12225478789. The next prime is 12225478831. The reversal of 12225478820 is 2887452221.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1826822 + ... + 1833501.

It is an arithmetic number, because the mean of its divisors is an integer number (1076135256).

Almost surely, 2^12225478820 is an apocalyptic number.

12225478820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12225478820 is an abundant number, since it is smaller than the sum of its proper divisors (13601767324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12225478820 is a wasteful number, since it uses less digits than its factorization.

12225478820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3660499 (or 3660497 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 41.

The spelling of 12225478820 in words is "twelve billion, two hundred twenty-five million, four hundred seventy-eight thousand, eight hundred twenty".