21890672338839 has 16 divisors (see below), whose sum is σ = 31487581969632. Its totient is φ = 13476166765568.

The previous prime is 21890672338823. The next prime is 21890672338883. The reversal of 21890672338839 is 93883327609812.

It is a cyclic number.

It is not a de Polignac number, because 21890672338839 - 2⁴ = 21890672338823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21890672338819) 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, 4049326254 + ... + 4049331659.

It is an arithmetic number, because the mean of its divisors is an integer number (1967973873102).

Almost surely, 2^{21890672338839} is an apocalyptic number.

21890672338839 is a deficient number, since it is larger than the sum of its proper divisors (9596909630793).

21890672338839 is a wasteful number, since it uses less digits than its factorization.

21890672338839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8098657986.

The product of its (nonzero) digits is 188116992, while the sum is 69.

The spelling of 21890672338839 in words is "twenty-one trillion, eight hundred ninety billion, six hundred seventy-two million, three hundred thirty-eight thousand, eight hundred thirty-nine".