211102221989 has 4 divisors (see below), whose sum is σ = 211165034700. Its totient is φ = 211039409280.

The previous prime is 211102221929. The next prime is 211102222013. The reversal of 211102221989 is 989122201112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 156131668225 + 54970553764 = 395135^2 + 234458^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211102221989 is a prime.

It is a super-2 number, since 2×211102221989² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211102221929) by changing a digit.

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, 31401314 + ... + 31408035.

It is an arithmetic number, because the mean of its divisors is an integer number (52791258675).

Almost surely, 2^211102221989 is an apocalyptic number.

It is an amenable number.

211102221989 is a deficient number, since it is larger than the sum of its proper divisors (62812711).

211102221989 is an equidigital number, since it uses as much as digits as its factorization.

211102221989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62812710.

The product of its (nonzero) digits is 10368, while the sum is 38.

The spelling of 211102221989 in words is "two hundred eleven billion, one hundred two million, two hundred twenty-one thousand, nine hundred eighty-nine".