21694334976 has 240 divisors, whose sum is σ = 68219751600. Its totient is φ = 6849847296.

The previous prime is 21694334969. The next prime is 21694334999. The reversal of 21694334976 is 67943349612.

It is a happy number.

21694334976 is a `hidden beast` number, since 2 + 169 + 433 + 49 + 7 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3148431 + ... + 3155313.

It is an arithmetic number, because the mean of its divisors is an integer number (284248965).

Almost surely, 2^21694334976 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 21694334976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34109875800).

21694334976 is an abundant number, since it is smaller than the sum of its proper divisors (46525416624).

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

21694334976 is an equidigital number, since it uses as much as digits as its factorization.

21694334976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6936 (or 6907 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 54.

The spelling of 21694334976 in words is "twenty-one billion, six hundred ninety-four million, three hundred thirty-four thousand, nine hundred seventy-six".