21696683928040 has 256 divisors, whose sum is σ = 57539935008000. Its totient is φ = 7286129786880.

The previous prime is 21696683927993. The next prime is 21696683928071. The reversal of 21696683928040 is 4082938669612.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 27465624 + ... + 28244536.

It is an arithmetic number, because the mean of its divisors is an integer number (224765371125).

Almost surely, 2^{21696683928040} is an apocalyptic number.

21696683928040 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 21696683928040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28769967504000).

21696683928040 is an abundant number, since it is smaller than the sum of its proper divisors (35843251079960).

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

21696683928040 is a wasteful number, since it uses less digits than its factorization.

21696683928040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779060 (or 779056 counting only the distinct ones).

The product of its (nonzero) digits is 53747712, while the sum is 64.

The spelling of 21696683928040 in words is "twenty-one trillion, six hundred ninety-six billion, six hundred eighty-three million, nine hundred twenty-eight thousand, forty".