1221312303331 has 2 divisors, whose sum is σ = 1221312303332. Its totient is φ = 1221312303330.

The previous prime is 1221312303287. The next prime is 1221312303361. The reversal of 1221312303331 is 1333032131221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221312303331 - 2¹¹ = 1221312301283 is a prime.

It is a super-2 number, since 2×1221312303331² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221312303296 and 1221312303305.

It is not a weakly prime, because it can be changed into another prime (1221312303361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610656151665 + 610656151666.

It is an arithmetic number, because the mean of its divisors is an integer number (610656151666).

Almost surely, 2^{1221312303331} is an apocalyptic number.

1221312303331 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221312303331 is an equidigital number, since it uses as much as digits as its factorization.

1221312303331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 1221312303331 its reverse (1333032131221), we get a palindrome (2554344434552).

The spelling of 1221312303331 in words is "one trillion, two hundred twenty-one billion, three hundred twelve million, three hundred three thousand, three hundred thirty-one".