113213291921 has 2 divisors, whose sum is σ = 113213291922. Its totient is φ = 113213291920.

The previous prime is 113213291857. The next prime is 113213291941. The reversal of 113213291921 is 129192312311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107757253696 + 5456038225 = 328264^2 + 73865^2 .

It is a cyclic number.

It is not a de Polignac number, because 113213291921 - 2⁶ = 113213291857 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (113213291941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56606645960 + 56606645961.

It is an arithmetic number, because the mean of its divisors is an integer number (56606645961).

Almost surely, 2^113213291921 is an apocalyptic number.

It is an amenable number.

113213291921 is a deficient number, since it is larger than the sum of its proper divisors (1).

113213291921 is an equidigital number, since it uses as much as digits as its factorization.

113213291921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 35.

The spelling of 113213291921 in words is "one hundred thirteen billion, two hundred thirteen million, two hundred ninety-one thousand, nine hundred twenty-one".