21679184690 has 8 divisors (see below), whose sum is σ = 39022532460. Its totient is φ = 8671673872.

The previous prime is 21679184689. The next prime is 21679184701. The reversal of 21679184690 is 9648197612.

It can be written as a sum of positive squares in 2 ways, for example, as 21114124249 + 565060441 = 145307^2 + 23771^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21679184690² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1083959225 + ... + 1083959244.

Almost surely, 2^21679184690 is an apocalyptic number.

21679184690 is a deficient number, since it is larger than the sum of its proper divisors (17343347770).

21679184690 is a wasteful number, since it uses less digits than its factorization.

21679184690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2167918476.

The product of its (nonzero) digits is 1306368, while the sum is 53.

The spelling of 21679184690 in words is "twenty-one billion, six hundred seventy-nine million, one hundred eighty-four thousand, six hundred ninety".