521222331121 has 2 divisors, whose sum is σ = 521222331122. Its totient is φ = 521222331120.

The previous prime is 521222331083. The next prime is 521222331139. The reversal of 521222331121 is 121133222125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 304084970721 + 217137360400 = 551439^2 + 465980^2 .

It is a cyclic number.

It is not a de Polignac number, because 521222331121 - 2¹⁵ = 521222298353 is a prime.

It is not a weakly prime, because it can be changed into another prime (521222334121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260611165560 + 260611165561.

It is an arithmetic number, because the mean of its divisors is an integer number (260611165561).

Almost surely, 2^521222331121 is an apocalyptic number.

It is an amenable number.

521222331121 is a deficient number, since it is larger than the sum of its proper divisors (1).

521222331121 is an equidigital number, since it uses as much as digits as its factorization.

521222331121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 25.

Adding to 521222331121 its reverse (121133222125), we get a palindrome (642355553246).

The spelling of 521222331121 in words is "five hundred twenty-one billion, two hundred twenty-two million, three hundred thirty-one thousand, one hundred twenty-one".