211222021986 has 24 divisors (see below), whose sum is σ = 457656321564. Its totient is φ = 70406016480.

The previous prime is 211222021963. The next prime is 211222021993. The reversal of 211222021986 is 689120222112.

211222021986 is a `hidden beast` number, since 211 + 2 + 220 + 219 + 8 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 201887563761 + 9334458225 = 449319^2 + 96615^2 .

It is a super-2 number, since 2×211222021986² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211222021986.

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 11 ways as a sum of consecutive naturals, for example, 1542016 + ... + 1673396.

Almost surely, 2^211222021986 is an apocalyptic number.

211222021986 is an abundant number, since it is smaller than the sum of its proper divisors (246434299578).

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

211222021986 is a wasteful number, since it uses less digits than its factorization.

211222021986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220706 (or 220703 counting only the distinct ones).

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

The spelling of 211222021986 in words is "two hundred eleven billion, two hundred twenty-two million, twenty-one thousand, nine hundred eighty-six".