21943631976 has 384 divisors, whose sum is σ = 69002357760. Its totient is φ = 5786726400.

The previous prime is 21943631959. The next prime is 21943631987. The reversal of 21943631976 is 67913634912.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 79218750 + ... + 79219026.

It is an arithmetic number, because the mean of its divisors is an integer number (179693640).

Almost surely, 2^21943631976 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 21943631976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34501178880).

21943631976 is an abundant number, since it is smaller than the sum of its proper divisors (47058725784).

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

21943631976 is a wasteful number, since it uses less digits than its factorization.

21943631976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425 (or 414 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 51.

The spelling of 21943631976 in words is "twenty-one billion, nine hundred forty-three million, six hundred thirty-one thousand, nine hundred seventy-six".