21929422139640 has 96 divisors (see below), whose sum is σ = 72615350733120. Its totient is φ = 5737509183744.

The previous prime is 21929422139593. The next prime is 21929422139701. The reversal of 21929422139640 is 4693122492912.

It is a happy number.

21929422139640 is a `hidden beast` number, since 2 + 1 + 9 + 29 + 4 + 221 + 396 + 4 + 0 = 666.

It is a congruent number.

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, 574651312 + ... + 574689471.

It is an arithmetic number, because the mean of its divisors is an integer number (756409903470).

Almost surely, 2^{21929422139640} is an apocalyptic number.

21929422139640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21929422139640 is an abundant number, since it is smaller than the sum of its proper divisors (50685928593480).

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

21929422139640 is a wasteful number, since it uses less digits than its factorization.

21929422139640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1149340853 (or 1149340846 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 54.

The spelling of 21929422139640 in words is "twenty-one trillion, nine hundred twenty-nine billion, four hundred twenty-two million, one hundred thirty-nine thousand, six hundred forty".