22217603978 has 8 divisors (see below), whose sum is σ = 33330463968. Its totient is φ = 11107449324.

The previous prime is 22217603959. The next prime is 22217603983. The reversal of 22217603978 is 87930671222.

It is a happy number.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 655676 + ... + 688727.

It is an arithmetic number, because the mean of its divisors is an integer number (4166307996).

Almost surely, 2^22217603978 is an apocalyptic number.

22217603978 is a deficient number, since it is larger than the sum of its proper divisors (11112859990).

22217603978 is a wasteful number, since it uses less digits than its factorization.

22217603978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1352668.

The product of its (nonzero) digits is 508032, while the sum is 47.

The spelling of 22217603978 in words is "twenty-two billion, two hundred seventeen million, six hundred three thousand, nine hundred seventy-eight".