22121221986 has 40 divisors (see below), whose sum is σ = 51166900224. Its totient is φ = 7135876440.

The previous prime is 22121221981. The next prime is 22121222027. The reversal of 22121221986 is 68912212122.

22121221986 is a `hidden beast` number, since 221 + 212 + 219 + 8 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 22121221986.

It is not an unprimeable number, because it can be changed into a prime (22121221981) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2197410 + ... + 2207453.

Almost surely, 2^22121221986 is an apocalyptic number.

22121221986 is an abundant number, since it is smaller than the sum of its proper divisors (29045678238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22121221986 is a wasteful number, since it uses less digits than its factorization.

22121221986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4404908 (or 4404899 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The spelling of 22121221986 in words is "twenty-two billion, one hundred twenty-one million, two hundred twenty-one thousand, nine hundred eighty-six".