21739139863998 has 32 divisors (see below), whose sum is σ = 45924544545792. Its totient is φ = 6849541440000.

The previous prime is 21739139863957. The next prime is 21739139863999. The reversal of 21739139863998 is 89936893193712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21739139863999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1359028003 + ... + 1359043998.

It is an arithmetic number, because the mean of its divisors is an integer number (1435142017056).

Almost surely, 2^{21739139863998} is an apocalyptic number.

21739139863998 is an abundant number, since it is smaller than the sum of its proper divisors (24185404681794).

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

21739139863998 is a wasteful number, since it uses less digits than its factorization.

21739139863998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2718072080.

The product of its digits is 952342272, while the sum is 78.

The spelling of 21739139863998 in words is "twenty-one trillion, seven hundred thirty-nine billion, one hundred thirty-nine million, eight hundred sixty-three thousand, nine hundred ninety-eight".