113128793221 has 2 divisors, whose sum is σ = 113128793222. Its totient is φ = 113128793220.

The previous prime is 113128793213. The next prime is 113128793231. The reversal of 113128793221 is 122397821311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76479902500 + 36648890721 = 276550^2 + 191439^2 .

It is an emirp because it is prime and its reverse (122397821311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 113128793221 - 2³ = 113128793213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (113128793231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56564396610 + 56564396611.

It is an arithmetic number, because the mean of its divisors is an integer number (56564396611).

Almost surely, 2^113128793221 is an apocalyptic number.

It is an amenable number.

113128793221 is a deficient number, since it is larger than the sum of its proper divisors (1).

113128793221 is an equidigital number, since it uses as much as digits as its factorization.

113128793221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 40.

The spelling of 113128793221 in words is "one hundred thirteen billion, one hundred twenty-eight million, seven hundred ninety-three thousand, two hundred twenty-one".