21377613679 has 16 divisors (see below), whose sum is σ = 22958011008. Its totient is φ = 19833403392.

The previous prime is 21377613667. The next prime is 21377613743. The reversal of 21377613679 is 97631677312.

It is a cyclic number.

It is not a de Polignac number, because 21377613679 - 2¹¹ = 21377611631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21377613629) 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, 2946234 + ... + 2953480.

It is an arithmetic number, because the mean of its divisors is an integer number (1434875688).

Almost surely, 2^21377613679 is an apocalyptic number.

21377613679 is a deficient number, since it is larger than the sum of its proper divisors (1580397329).

21377613679 is a wasteful number, since it uses less digits than its factorization.

21377613679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9714.

The product of its digits is 2000376, while the sum is 52.

The spelling of 21377613679 in words is "twenty-one billion, three hundred seventy-seven million, six hundred thirteen thousand, six hundred seventy-nine".