21879031274 has 4 divisors (see below), whose sum is σ = 32818546914. Its totient is φ = 10939515636.

The previous prime is 21879031271. The next prime is 21879031289. The reversal of 21879031274 is 47213097812.

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., 11716980025 + 10162051249 = 108245^2 + 100807^2 .

It is not an unprimeable number, because it can be changed into a prime (21879031271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5469757817 + ... + 5469757820.

Almost surely, 2^21879031274 is an apocalyptic number.

21879031274 is a deficient number, since it is larger than the sum of its proper divisors (10939515640).

21879031274 is a wasteful number, since it uses less digits than its factorization.

21879031274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10939515639.

The product of its (nonzero) digits is 169344, while the sum is 44.

The spelling of 21879031274 in words is "twenty-one billion, eight hundred seventy-nine million, thirty-one thousand, two hundred seventy-four".