21377492751 has 8 divisors (see below), whose sum is σ = 28503999280. Its totient is φ = 14251324032.

The previous prime is 21377492671. The next prime is 21377492777. The reversal of 21377492751 is 15729477312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21377492751 - 2²⁷ = 21243275023 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21377492751.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21377497751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202455 + ... + 289383.

It is an arithmetic number, because the mean of its divisors is an integer number (3562999910).

Almost surely, 2^21377492751 is an apocalyptic number.

21377492751 is a deficient number, since it is larger than the sum of its proper divisors (7126506529).

21377492751 is an equidigital number, since it uses as much as digits as its factorization.

21377492751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168905.

The product of its digits is 740880, while the sum is 48.

The spelling of 21377492751 in words is "twenty-one billion, three hundred seventy-seven million, four hundred ninety-two thousand, seven hundred fifty-one".