21683009188 has 24 divisors (see below), whose sum is σ = 39282437880. Its totient is φ = 10460002560.

The previous prime is 21683009141. The next prime is 21683009207. The reversal of 21683009188 is 88190038612.

It can be written as a sum of positive squares in 4 ways, for example, as 4618289764 + 17064719424 = 67958^2 + 130632^2 .

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92520 + ... + 227872.

It is an arithmetic number, because the mean of its divisors is an integer number (1636768245).

Almost surely, 2^21683009188 is an apocalyptic number.

It is an amenable number.

21683009188 is a deficient number, since it is larger than the sum of its proper divisors (17599428692).

21683009188 is a wasteful number, since it uses less digits than its factorization.

21683009188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136767 (or 136765 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 46.

The spelling of 21683009188 in words is "twenty-one billion, six hundred eighty-three million, nine thousand, one hundred eighty-eight".