21298911238 has 32 divisors (see below), whose sum is σ = 35219059200. Its totient is φ = 9579725760.

The previous prime is 21298911173. The next prime is 21298911239. The reversal of 21298911238 is 83211989212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21298911239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3638538 + ... + 3644386.

It is an arithmetic number, because the mean of its divisors is an integer number (1100595600).

Almost surely, 2^21298911238 is an apocalyptic number.

21298911238 is a deficient number, since it is larger than the sum of its proper divisors (13920147962).

21298911238 is a wasteful number, since it uses less digits than its factorization.

21298911238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7572.

The product of its digits is 124416, while the sum is 46.

The spelling of 21298911238 in words is "twenty-one billion, two hundred ninety-eight million, nine hundred eleven thousand, two hundred thirty-eight".