21969235388 has 12 divisors (see below), whose sum is σ = 40707700992. Its totient is φ = 10338463680.

The previous prime is 21969235361. The next prime is 21969235429. The reversal of 21969235388 is 88353296912.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161538428 + ... + 161538563.

It is an arithmetic number, because the mean of its divisors is an integer number (3392308416).

Almost surely, 2^21969235388 is an apocalyptic number.

It is an amenable number.

21969235388 is a deficient number, since it is larger than the sum of its proper divisors (18738465604).

21969235388 is a wasteful number, since it uses less digits than its factorization.

21969235388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323077012 (or 323077010 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 56.

The spelling of 21969235388 in words is "twenty-one billion, nine hundred sixty-nine million, two hundred thirty-five thousand, three hundred eighty-eight".