102221989 has 2 divisors, whose sum is σ = 102221990. Its totient is φ = 102221988.

The previous prime is 102221983. The next prime is 102222023. The reversal of 102221989 is 989122201.

It is an a-pointer prime, because the next prime (102222023) can be obtained adding 102221989 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101304225 + 917764 = 10065^2 + 958^2 .

It is an emirp because it is prime and its reverse (989122201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102221989 - 2¹⁵ = 102189221 is a prime.

It is a super-2 number, since 2×102221989² = 20898670070232242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102221983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51110994 + 51110995.

It is an arithmetic number, because the mean of its divisors is an integer number (51110995).

Almost surely, 2^102221989 is an apocalyptic number.

It is an amenable number.

102221989 is a deficient number, since it is larger than the sum of its proper divisors (1).

102221989 is an equidigital number, since it uses as much as digits as its factorization.

102221989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 102221989 is about 10110.4890583987. The cubic root of 102221989 is about 467.5715833079.

The spelling of 102221989 in words is "one hundred two million, two hundred twenty-one thousand, nine hundred eighty-nine".