12215432400 has 60 divisors (see below), whose sum is σ = 39130105632. Its totient is φ = 3257448320.

The previous prime is 12215432351. The next prime is 12215432401. The reversal of 12215432400 is 423451221.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12215432401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5088564 + ... + 5090963.

Almost surely, 2^12215432400 is an apocalyptic number.

12215432400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12215432400 is an abundant number, since it is smaller than the sum of its proper divisors (26914673232).

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

12215432400 is a wasteful number, since it uses less digits than its factorization.

12215432400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10179548 (or 10179537 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 12215432400 its reverse (423451221), we get a palindrome (12638883621).

The spelling of 12215432400 in words is "twelve billion, two hundred fifteen million, four hundred thirty-two thousand, four hundred".