223313131721 has 2 divisors, whose sum is σ = 223313131722. Its totient is φ = 223313131720.

The previous prime is 223313131711. The next prime is 223313131733. The reversal of 223313131721 is 127131313322.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146891293696 + 76421838025 = 383264^2 + 276445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-223313131721 is a prime.

It is not a weakly prime, because it can be changed into another prime (223313131711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111656565860 + 111656565861.

It is an arithmetic number, because the mean of its divisors is an integer number (111656565861).

Almost surely, 2^223313131721 is an apocalyptic number.

It is an amenable number.

223313131721 is a deficient number, since it is larger than the sum of its proper divisors (1).

223313131721 is an equidigital number, since it uses as much as digits as its factorization.

223313131721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 29.

The spelling of 223313131721 in words is "two hundred twenty-three billion, three hundred thirteen million, one hundred thirty-one thousand, seven hundred twenty-one".