21339801708 has 24 divisors (see below), whose sum is σ = 49795838400. Its totient is φ = 7112843280.

The previous prime is 21339801671. The next prime is 21339801709. The reversal of 21339801708 is 80710893312.

It is a self number, because there is not a number n which added to its sum of digits gives 21339801708.

It is not an unprimeable number, because it can be changed into a prime (21339801709) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208243 + ... + 293333.

It is an arithmetic number, because the mean of its divisors is an integer number (2074826600).

Almost surely, 2^21339801708 is an apocalyptic number.

It is an amenable number.

21339801708 is an abundant number, since it is smaller than the sum of its proper divisors (28456036692).

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

21339801708 is a wasteful number, since it uses less digits than its factorization.

21339801708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105997 (or 105995 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The spelling of 21339801708 in words is "twenty-one billion, three hundred thirty-nine million, eight hundred one thousand, seven hundred eight".