21474234955 has 4 divisors (see below), whose sum is σ = 25769081952. Its totient is φ = 17179387960.

The previous prime is 21474234919. The next prime is 21474235001. The reversal of 21474234955 is 55943247412.

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

It is not a de Polignac number, because 21474234955 - 2³¹ = 19326751307 is a prime.

It is a super-2 number, since 2×21474234955² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2147423491 + ... + 2147423500.

It is an arithmetic number, because the mean of its divisors is an integer number (6442270488).

Almost surely, 2^21474234955 is an apocalyptic number.

21474234955 is a deficient number, since it is larger than the sum of its proper divisors (4294846997).

21474234955 is an equidigital number, since it uses as much as digits as its factorization.

21474234955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4294846996.

The product of its digits is 1209600, while the sum is 46.

The spelling of 21474234955 in words is "twenty-one billion, four hundred seventy-four million, two hundred thirty-four thousand, nine hundred fifty-five".