21439165009998 has 32 divisors (see below), whose sum is σ = 42987923292960. Its totient is φ = 7128124122240.

The previous prime is 21439165009981. The next prime is 21439165010041. The reversal of 21439165009998 is 89990056193412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70691748 + ... + 70994376.

It is an arithmetic number, because the mean of its divisors is an integer number (1343372602905).

Almost surely, 2^{21439165009998} is an apocalyptic number.

21439165009998 is an abundant number, since it is smaller than the sum of its proper divisors (21548758282962).

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

21439165009998 is a wasteful number, since it uses less digits than its factorization.

21439165009998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332772.

The product of its (nonzero) digits is 37791360, while the sum is 66.

The spelling of 21439165009998 in words is "twenty-one trillion, four hundred thirty-nine billion, one hundred sixty-five million, nine thousand, nine hundred ninety-eight".