21670612992 has 780 divisors, whose sum is σ = 79542604416. Its totient is φ = 5852528640.

The previous prime is 21670612981. The next prime is 21670613071. The reversal of 21670612992 is 29921607612.

21670612992 is a `hidden beast` number, since 21 + 6 + 7 + 0 + 612 + 9 + 9 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 503967723 + ... + 503967765.

Almost surely, 2^21670612992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21670612992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39771302208).

21670612992 is an abundant number, since it is smaller than the sum of its proper divisors (57871991424).

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

21670612992 is an equidigital number, since it uses as much as digits as its factorization.

21670612992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124 (or 86 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The spelling of 21670612992 in words is "twenty-one billion, six hundred seventy million, six hundred twelve thousand, nine hundred ninety-two".