21374263644639 has 16 divisors (see below), whose sum is σ = 28503764214528. Its totient is φ = 14247136334592.

The previous prime is 21374263644631. The next prime is 21374263644641. The reversal of 21374263644639 is 93644636247312.

It is not a de Polignac number, because 21374263644639 - 2³ = 21374263644631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21374263644631) by changing a digit.

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, 658321884 + ... + 658354350.

It is an arithmetic number, because the mean of its divisors is an integer number (1781485263408).

Almost surely, 2^{21374263644639} is an apocalyptic number.

21374263644639 is a deficient number, since it is larger than the sum of its proper divisors (7129500569889).

21374263644639 is a wasteful number, since it uses less digits than its factorization.

21374263644639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62254.

The product of its digits is 94058496, while the sum is 60.

The spelling of 21374263644639 in words is "twenty-one trillion, three hundred seventy-four billion, two hundred sixty-three million, six hundred forty-four thousand, six hundred thirty-nine".