21132121013312 has 56 divisors (see below), whose sum is σ = 43802062678656. Its totient is φ = 10096321292288.

The previous prime is 21132121013291. The next prime is 21132121013321. The reversal of 21132121013312 is 21331012123112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (23).

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, 5908868 + ... + 8785155.

Almost surely, 2^{21132121013312} is an apocalyptic number.

It is an amenable number.

21132121013312 is an abundant number, since it is smaller than the sum of its proper divisors (22669941665344).

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

21132121013312 is a wasteful number, since it uses less digits than its factorization.

21132121013312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14695035 (or 14695025 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 21132121013312 its reverse (21331012123112), we get a palindrome (42463133136424).

The spelling of 21132121013312 in words is "twenty-one trillion, one hundred thirty-two billion, one hundred twenty-one million, thirteen thousand, three hundred twelve".