21122838874 has 4 divisors (see below), whose sum is σ = 31684258314. Its totient is φ = 10561419436.

The previous prime is 21122838871. The next prime is 21122838907. The reversal of 21122838874 is 47883822112.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 19267383249 + 1855455625 = 138807^2 + 43075^2 .

It is not an unprimeable number, because it can be changed into a prime (21122838871) 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 as a sum of consecutive naturals, namely, 5280709717 + ... + 5280709720.

Almost surely, 2^21122838874 is an apocalyptic number.

21122838874 is a deficient number, since it is larger than the sum of its proper divisors (10561419440).

21122838874 is a wasteful number, since it uses less digits than its factorization.

21122838874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10561419439.

The product of its digits is 344064, while the sum is 46.

The spelling of 21122838874 in words is "twenty-one billion, one hundred twenty-two million, eight hundred thirty-eight thousand, eight hundred seventy-four".