21610939399984 has 80 divisors (see below), whose sum is σ = 47476708439040. Its totient is φ = 9439474464000.

The previous prime is 21610939399979. The next prime is 21610939400087. The reversal of 21610939399984 is 48999393901612.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8956512 + ... + 11110399.

It is an arithmetic number, because the mean of its divisors is an integer number (593458855488).

Almost surely, 2^{21610939399984} is an apocalyptic number.

It is an amenable number.

21610939399984 is an abundant number, since it is smaller than the sum of its proper divisors (25865769039056).

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

21610939399984 is a wasteful number, since it uses less digits than its factorization.

21610939399984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20067170 (or 20067164 counting only the distinct ones).

The product of its (nonzero) digits is 204073344, while the sum is 73.

The spelling of 21610939399984 in words is "twenty-one trillion, six hundred ten billion, nine hundred thirty-nine million, three hundred ninety-nine thousand, nine hundred eighty-four".