21612231456012 has 72 divisors (see below), whose sum is σ = 56314469137472. Its totient is φ = 6983507404800.

The previous prime is 21612231456007. The next prime is 21612231456031. The reversal of 21612231456012 is 21065413221612.

21612231456012 is a `hidden beast` number, since 2 + 1 + 6 + 1 + 2 + 2 + 3 + 1 + 45 + 601 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29575189 + ... + 30297132.

Almost surely, 2^{21612231456012} is an apocalyptic number.

It is an amenable number.

21612231456012 is an abundant number, since it is smaller than the sum of its proper divisors (34702237681460).

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

21612231456012 is a wasteful number, since it uses less digits than its factorization.

21612231456012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59872639 (or 59872634 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

Adding to 21612231456012 its reverse (21065413221612), we get a palindrome (42677644677624).

The spelling of 21612231456012 in words is "twenty-one trillion, six hundred twelve billion, two hundred thirty-one million, four hundred fifty-six thousand, twelve".