222220131521 has 2 divisors, whose sum is σ = 222220131522. Its totient is φ = 222220131520.

The previous prime is 222220131499. The next prime is 222220131587. The reversal of 222220131521 is 125131022222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144175887025 + 78044244496 = 379705^2 + 279364^2 .

It is a cyclic number.

It is not a de Polignac number, because 222220131521 - 2¹⁴ = 222220115137 is a prime.

It is not a weakly prime, because it can be changed into another prime (222220137521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111110065760 + 111110065761.

It is an arithmetic number, because the mean of its divisors is an integer number (111110065761).

Almost surely, 2^222220131521 is an apocalyptic number.

It is an amenable number.

222220131521 is a deficient number, since it is larger than the sum of its proper divisors (1).

222220131521 is an equidigital number, since it uses as much as digits as its factorization.

222220131521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 222220131521 its reverse (125131022222), we get a palindrome (347351153743).

The spelling of 222220131521 in words is "two hundred twenty-two billion, two hundred twenty million, one hundred thirty-one thousand, five hundred twenty-one".