102211221989 has 4 divisors (see below), whose sum is σ = 102381291180. Its totient is φ = 102041152800.

The previous prime is 102211221977. The next prime is 102211222027. The reversal of 102211221989 is 989122112201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 989122112201 = 38803 ⋅25490867.

It can be written as a sum of positive squares in 2 ways, for example, as 40063224964 + 62147997025 = 200158^2 + 249295^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102211221989 is a prime.

It is a super-2 number, since 2×102211221989² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102211221929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85033694 + ... + 85034895.

It is an arithmetic number, because the mean of its divisors is an integer number (25595322795).

Almost surely, 2^102211221989 is an apocalyptic number.

It is an amenable number.

102211221989 is a deficient number, since it is larger than the sum of its proper divisors (170069191).

102211221989 is an equidigital number, since it uses as much as digits as its factorization.

102211221989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170069190.

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

The spelling of 102211221989 in words is "one hundred two billion, two hundred eleven million, two hundred twenty-one thousand, nine hundred eighty-nine".