21972893834 has 16 divisors (see below), whose sum is σ = 33226886880. Its totient is φ = 10897345680.

The previous prime is 21972893821. The next prime is 21972893867. The reversal of 21972893834 is 43839827912.

It is a self number, because there is not a number n which added to its sum of digits gives 21972893834.

It is an unprimeable number.

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, 558152 + ... + 596220.

It is an arithmetic number, because the mean of its divisors is an integer number (2076680430).

Almost surely, 2^21972893834 is an apocalyptic number.

21972893834 is a deficient number, since it is larger than the sum of its proper divisors (11253993046).

21972893834 is a wasteful number, since it uses less digits than its factorization.

21972893834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40405.

The product of its digits is 5225472, while the sum is 56.

The spelling of 21972893834 in words is "twenty-one billion, nine hundred seventy-two million, eight hundred ninety-three thousand, eight hundred thirty-four".