2312381221 has 2 divisors, whose sum is σ = 2312381222. Its totient is φ = 2312381220.

The previous prime is 2312381189. The next prime is 2312381237. The reversal of 2312381221 is 1221832132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1419028900 + 893352321 = 37670^2 + 29889^2 .

It is a cyclic number.

It is not a de Polignac number, because 2312381221 - 2⁵ = 2312381189 is a prime.

It is a super-2 number, since 2×2312381221² = 10694213822466901682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2312381261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1156190610 + 1156190611.

It is an arithmetic number, because the mean of its divisors is an integer number (1156190611).

Almost surely, 2^2312381221 is an apocalyptic number.

It is an amenable number.

2312381221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2312381221 is an equidigital number, since it uses as much as digits as its factorization.

2312381221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 25.

The square root of 2312381221 is about 48087.2251330850. The cubic root of 2312381221 is about 1322.3704767002.

The spelling of 2312381221 in words is "two billion, three hundred twelve million, three hundred eighty-one thousand, two hundred twenty-one".