21964755986 has 16 divisors (see below), whose sum is σ = 33140067840. Its totient is φ = 10918099920.

The previous prime is 21964755949. The next prime is 21964756061. The reversal of 21964755986 is 68955746912.

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, 2049935 + ... + 2060621.

It is an arithmetic number, because the mean of its divisors is an integer number (2071254240).

Almost surely, 2^21964755986 is an apocalyptic number.

21964755986 is a deficient number, since it is larger than the sum of its proper divisors (11175311854).

21964755986 is a wasteful number, since it uses less digits than its factorization.

21964755986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16609.

The product of its digits is 32659200, while the sum is 62.

The spelling of 21964755986 in words is "twenty-one billion, nine hundred sixty-four million, seven hundred fifty-five thousand, nine hundred eighty-six".