21976606400 has 168 divisors, whose sum is σ = 62008694880. Its totient is φ = 7509565440.

The previous prime is 21976606387. The next prime is 21976606489. The reversal of 21976606400 is 460667912.

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, 3502466 + ... + 3508734.

Almost surely, 2^21976606400 is an apocalyptic number.

21976606400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21976606400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31004347440).

21976606400 is an abundant number, since it is smaller than the sum of its proper divisors (40032088480).

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

21976606400 is a wasteful number, since it uses less digits than its factorization.

21976606400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6611 (or 6596 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 41.

The spelling of 21976606400 in words is "twenty-one billion, nine hundred seventy-six million, six hundred six thousand, four hundred".