21552031202412 has 24 divisors (see below), whose sum is σ = 50288351441776. Its totient is φ = 7183970595648.

The previous prime is 21552031202399. The next prime is 21552031202453. The reversal of 21552031202412 is 21420213025512.

It is a self number, because there is not a number n which added to its sum of digits gives 21552031202412.

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, 2677183 + ... + 7090230.

Almost surely, 2^{21552031202412} is an apocalyptic number.

It is an amenable number.

21552031202412 is an abundant number, since it is smaller than the sum of its proper divisors (28736320239364).

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

21552031202412 is a wasteful number, since it uses less digits than its factorization.

21552031202412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9951297 (or 9951295 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 21552031202412 its reverse (21420213025512), we get a palindrome (42972244227924).

The spelling of 21552031202412 in words is "twenty-one trillion, five hundred fifty-two billion, thirty-one million, two hundred two thousand, four hundred twelve".