21684252146 has 8 divisors (see below), whose sum is σ = 32760381360. Its totient is φ = 10764125028.

The previous prime is 21684252103. The next prime is 21684252173. The reversal of 21684252146 is 64125248612.

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

It is a super-2 number, since 2×21684252146² (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, 39000176 + ... + 39000731.

It is an arithmetic number, because the mean of its divisors is an integer number (4095047670).

Almost surely, 2^21684252146 is an apocalyptic number.

21684252146 is a deficient number, since it is larger than the sum of its proper divisors (11076129214).

21684252146 is a wasteful number, since it uses less digits than its factorization.

21684252146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78001048.

The product of its digits is 184320, while the sum is 41.

The spelling of 21684252146 in words is "twenty-one billion, six hundred eighty-four million, two hundred fifty-two thousand, one hundred forty-six".