310232111221 has 2 divisors, whose sum is σ = 310232111222. Its totient is φ = 310232111220.

The previous prime is 310232111209. The next prime is 310232111263. The reversal of 310232111221 is 122111232013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 308009460196 + 2222651025 = 554986^2 + 47145^2 .

It is a cyclic number.

It is not a de Polignac number, because 310232111221 - 2³¹ = 308084627573 is a prime.

It is a super-2 number, since 2×310232111221² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (310232111921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155116055610 + 155116055611.

It is an arithmetic number, because the mean of its divisors is an integer number (155116055611).

Almost surely, 2^310232111221 is an apocalyptic number.

It is an amenable number.

310232111221 is a deficient number, since it is larger than the sum of its proper divisors (1).

310232111221 is an equidigital number, since it uses as much as digits as its factorization.

310232111221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 310232111221 its reverse (122111232013), we get a palindrome (432343343234).

The spelling of 310232111221 in words is "three hundred ten billion, two hundred thirty-two million, one hundred eleven thousand, two hundred twenty-one".