21344392971 has 32 divisors (see below), whose sum is σ = 34812518400. Its totient is φ = 12817297440.

The previous prime is 21344392939. The next prime is 21344392973. The reversal of 21344392971 is 17929344312.

21344392971 is a `hidden beast` number, since 213 + 44 + 392 + 9 + 7 + 1 = 666.

It is not a de Polignac number, because 21344392971 - 2⁵ = 21344392939 is a prime.

It is a super-2 number, since 2×21344392971² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21344392973) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 297291 + ... + 362036.

It is an arithmetic number, because the mean of its divisors is an integer number (1087891200).

Almost surely, 2^21344392971 is an apocalyptic number.

21344392971 is a deficient number, since it is larger than the sum of its proper divisors (13468125429).

21344392971 is a wasteful number, since it uses less digits than its factorization.

21344392971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659456 (or 659450 counting only the distinct ones).

The product of its digits is 326592, while the sum is 45.

The spelling of 21344392971 in words is "twenty-one billion, three hundred forty-four million, three hundred ninety-two thousand, nine hundred seventy-one".