12215156412 has 48 divisors (see below), whose sum is σ = 28783696032. Its totient is φ = 4031677440.

The previous prime is 12215156351. The next prime is 12215156413. The reversal of 12215156412 is 21465151221.

It is a self number, because there is not a number n which added to its sum of digits gives 12215156412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12215156413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 494008 + ... + 518144.

It is an arithmetic number, because the mean of its divisors is an integer number (599660334).

Almost surely, 2^12215156412 is an apocalyptic number.

12215156412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12215156412 is an abundant number, since it is smaller than the sum of its proper divisors (16568539620).

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

12215156412 is a wasteful number, since it uses less digits than its factorization.

12215156412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24558 (or 24556 counting only the distinct ones).

The product of its digits is 4800, while the sum is 30.

The spelling of 12215156412 in words is "twelve billion, two hundred fifteen million, one hundred fifty-six thousand, four hundred twelve".