21885139371 has 4 divisors (see below), whose sum is σ = 29180185832. Its totient is φ = 14590092912.

The previous prime is 21885139301. The next prime is 21885139447. The reversal of 21885139371 is 17393158812.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21885139371 - 2⁹ = 21885138859 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 21885139371.

It is not an unprimeable number, because it can be changed into a prime (21885139301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3647523226 + ... + 3647523231.

It is an arithmetic number, because the mean of its divisors is an integer number (7295046458).

Almost surely, 2^21885139371 is an apocalyptic number.

21885139371 is a deficient number, since it is larger than the sum of its proper divisors (7295046461).

21885139371 is an equidigital number, since it uses as much as digits as its factorization.

21885139371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7295046460.

The product of its digits is 362880, while the sum is 48.

The spelling of 21885139371 in words is "twenty-one billion, eight hundred eighty-five million, one hundred thirty-nine thousand, three hundred seventy-one".