223121311717 has 2 divisors, whose sum is σ = 223121311718. Its totient is φ = 223121311716.

The previous prime is 223121311691. The next prime is 223121311741. The reversal of 223121311717 is 717113121322.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 223035174756 + 86136961 = 472266^2 + 9281^2 .

It is a cyclic number.

It is not a de Polignac number, because 223121311717 - 2¹⁹ = 223120787429 is a prime.

It is a super-3 number, since 3×223121311717³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223121311817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111560655858 + 111560655859.

It is an arithmetic number, because the mean of its divisors is an integer number (111560655859).

Almost surely, 2^223121311717 is an apocalyptic number.

It is an amenable number.

223121311717 is a deficient number, since it is larger than the sum of its proper divisors (1).

223121311717 is an equidigital number, since it uses as much as digits as its factorization.

223121311717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3528, while the sum is 31.

The spelling of 223121311717 in words is "two hundred twenty-three billion, one hundred twenty-one million, three hundred eleven thousand, seven hundred seventeen".