1221230212313 has 2 divisors, whose sum is σ = 1221230212314. Its totient is φ = 1221230212312.

The previous prime is 1221230212271. The next prime is 1221230212337. The reversal of 1221230212313 is 3132120321221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1030403647744 + 190826564569 = 1015088^2 + 436837^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221230212313 - 2²⁶ = 1221163103449 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221230212393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610615106156 + 610615106157.

It is an arithmetic number, because the mean of its divisors is an integer number (610615106157).

Almost surely, 2^{1221230212313} is an apocalyptic number.

It is an amenable number.

1221230212313 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221230212313 is an equidigital number, since it uses as much as digits as its factorization.

1221230212313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 1221230212313 its reverse (3132120321221), we get a palindrome (4353350533534).

The spelling of 1221230212313 in words is "one trillion, two hundred twenty-one billion, two hundred thirty million, two hundred twelve thousand, three hundred thirteen".