21914164978 has 8 divisors (see below), whose sum is σ = 32873310720. Its totient is φ = 10956394740.

The previous prime is 21914164939. The next prime is 21914165011. The reversal of 21914164978 is 87946141912.

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

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, 303078 + ... + 368353.

It is an arithmetic number, because the mean of its divisors is an integer number (4109163840).

Almost surely, 2^21914164978 is an apocalyptic number.

21914164978 is a deficient number, since it is larger than the sum of its proper divisors (10959145742).

21914164978 is a wasteful number, since it uses less digits than its factorization.

21914164978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687752.

The product of its digits is 870912, while the sum is 52.

The spelling of 21914164978 in words is "twenty-one billion, nine hundred fourteen million, one hundred sixty-four thousand, nine hundred seventy-eight".