21791269384 has 16 divisors (see below), whose sum is σ = 40860197820. Its totient is φ = 10895216640.

The previous prime is 21791269351. The next prime is 21791269421. The reversal of 21791269384 is 48396219712.

It can be written as a sum of positive squares in 2 ways, for example, as 18265522500 + 3525746884 = 135150^2 + 59378^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 369624 + ... + 424504.

Almost surely, 2^21791269384 is an apocalyptic number.

It is an amenable number.

21791269384 is a deficient number, since it is larger than the sum of its proper divisors (19068928436).

21791269384 is a wasteful number, since it uses less digits than its factorization.

21791269384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104520 (or 104516 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 52.

It can be divided in two parts, 217912 and 69384, that added together give a square (287296 = 536²).

The spelling of 21791269384 in words is "twenty-one billion, seven hundred ninety-one million, two hundred sixty-nine thousand, three hundred eighty-four".