21112612672 has 28 divisors (see below), whose sum is σ = 41902566436. Its totient is φ = 10554485760.

The previous prime is 21112612621. The next prime is 21112612673. The reversal of 21112612672 is 27621621112.

It can be written as a sum of positive squares in 2 ways, for example, as 9521075776 + 11591536896 = 97576^2 + 107664^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112612673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 394222 + ... + 444562.

Almost surely, 2^21112612672 is an apocalyptic number.

It is an amenable number.

21112612672 is a deficient number, since it is larger than the sum of its proper divisors (20789953764).

21112612672 is an equidigital number, since it uses as much as digits as its factorization.

21112612672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56906 (or 56896 counting only the distinct ones).

The product of its digits is 4032, while the sum is 31.

The spelling of 21112612672 in words is "twenty-one billion, one hundred twelve million, six hundred twelve thousand, six hundred seventy-two".