221010111221989 has 2 divisors, whose sum is σ = 221010111221990. Its totient is φ = 221010111221988.

The previous prime is 221010111221959. The next prime is 221010111222001. The reversal of 221010111221989 is 989122111010122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210024585450625 + 10985525771364 = 14492225^2 + 3314442^2 .

It is a cyclic number.

It is not a de Polignac number, because 221010111221989 - 2¹³ = 221010111213797 is a prime.

It is a super-2 number, since 2×221010111221989² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221010111221959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110505055610994 + 110505055610995.

It is an arithmetic number, because the mean of its divisors is an integer number (110505055610995).

Almost surely, 2^{221010111221989} is an apocalyptic number.

It is an amenable number.

221010111221989 is a deficient number, since it is larger than the sum of its proper divisors (1).

221010111221989 is an equidigital number, since it uses as much as digits as its factorization.

221010111221989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 40.

The spelling of 221010111221989 in words is "two hundred twenty-one trillion, ten billion, one hundred eleven million, two hundred twenty-one thousand, nine hundred eighty-nine".