12215442400 has 72 divisors (see below), whose sum is σ = 34081099920. Its totient is φ = 4188149760.

The previous prime is 12215442397. The next prime is 12215442413. The reversal of 12215442400 is 424451221.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1085065 + ... + 1096264.

It is an arithmetic number, because the mean of its divisors is an integer number (473348610).

Almost surely, 2^12215442400 is an apocalyptic number.

12215442400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12215442400 is an abundant number, since it is smaller than the sum of its proper divisors (21865657520).

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

12215442400 is a wasteful number, since it uses less digits than its factorization.

12215442400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2181356 (or 2181343 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 25.

Adding to 12215442400 its reverse (424451221), we get a palindrome (12639893621).

The spelling of 12215442400 in words is "twelve billion, two hundred fifteen million, four hundred forty-two thousand, four hundred".