12312033221 has 2 divisors, whose sum is σ = 12312033222. Its totient is φ = 12312033220.

The previous prime is 12312033133. The next prime is 12312033263. The reversal of 12312033221 is 12233021321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9406284196 + 2905749025 = 96986^2 + 53905^2 .

It is a cyclic number.

It is not a de Polignac number, because 12312033221 - 2¹⁸ = 12311771077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12312033193 and 12312033202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12312035221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6156016610 + 6156016611.

It is an arithmetic number, because the mean of its divisors is an integer number (6156016611).

Almost surely, 2^12312033221 is an apocalyptic number.

It is an amenable number.

12312033221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12312033221 is an equidigital number, since it uses as much as digits as its factorization.

12312033221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 12312033221 its reverse (12233021321), we get a palindrome (24545054542).

The spelling of 12312033221 in words is "twelve billion, three hundred twelve million, thirty-three thousand, two hundred twenty-one".