113121221989 has 2 divisors, whose sum is σ = 113121221990. Its totient is φ = 113121221988.

The previous prime is 113121221963. The next prime is 113121222059. The reversal of 113121221989 is 989122121311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106901533764 + 6219688225 = 326958^2 + 78865^2 .

It is a cyclic number.

It is not a de Polignac number, because 113121221989 - 2⁵ = 113121221957 is a prime.

It is a super-2 number, since 2×113121221989² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (113121221929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56560610994 + 56560610995.

It is an arithmetic number, because the mean of its divisors is an integer number (56560610995).

Almost surely, 2^113121221989 is an apocalyptic number.

It is an amenable number.

113121221989 is a deficient number, since it is larger than the sum of its proper divisors (1).

113121221989 is an equidigital number, since it uses as much as digits as its factorization.

113121221989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 40.

The spelling of 113121221989 in words is "one hundred thirteen billion, one hundred twenty-one million, two hundred twenty-one thousand, nine hundred eighty-nine".