113111312021 has 2 divisors, whose sum is σ = 113111312022. Its totient is φ = 113111312020.

The previous prime is 113111312011. The next prime is 113111312051. The reversal of 113111312021 is 120213111311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81918453796 + 31192858225 = 286214^2 + 176615^2 .

It is an emirp because it is prime and its reverse (120213111311) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-113111312021 is a prime.

It is a super-2 number, since 2×113111312021² (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 (113111312011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56555656010 + 56555656011.

It is an arithmetic number, because the mean of its divisors is an integer number (56555656011).

Almost surely, 2^113111312021 is an apocalyptic number.

It is an amenable number.

113111312021 is a deficient number, since it is larger than the sum of its proper divisors (1).

113111312021 is an equidigital number, since it uses as much as digits as its factorization.

113111312021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 113111312021 its reverse (120213111311), we get a palindrome (233324423332).

The spelling of 113111312021 in words is "one hundred thirteen billion, one hundred eleven million, three hundred twelve thousand, twenty-one".