21955284279 has 8 divisors (see below), whose sum is σ = 32526347120. Its totient is φ = 14636856168.

The previous prime is 21955284269. The next prime is 21955284283. The reversal of 21955284279 is 97248255912.

21955284279 is a `hidden beast` number, since 2 + 1 + 9 + 5 + 528 + 42 + 79 = 666.

It is not a de Polignac number, because 21955284279 - 2⁸ = 21955284023 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 (21955284269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 406579312 + ... + 406579365.

It is an arithmetic number, because the mean of its divisors is an integer number (4065793390).

Almost surely, 2^21955284279 is an apocalyptic number.

21955284279 is a deficient number, since it is larger than the sum of its proper divisors (10571062841).

21955284279 is an equidigital number, since it uses as much as digits as its factorization.

21955284279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 813158686 (or 813158680 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 54.

The spelling of 21955284279 in words is "twenty-one billion, nine hundred fifty-five million, two hundred eighty-four thousand, two hundred seventy-nine".