1221202392013 has 2 divisors, whose sum is σ = 1221202392014. Its totient is φ = 1221202392012.

The previous prime is 1221202391953. The next prime is 1221202392029. The reversal of 1221202392013 is 3102932021221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 800958771369 + 420243620644 = 894963^2 + 648262^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221202392013 - 2³³ = 1212612457421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221202392073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610601196006 + 610601196007.

It is an arithmetic number, because the mean of its divisors is an integer number (610601196007).

Almost surely, 2^{1221202392013} is an apocalyptic number.

It is an amenable number.

1221202392013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221202392013 is an equidigital number, since it uses as much as digits as its factorization.

1221202392013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The spelling of 1221202392013 in words is "one trillion, two hundred twenty-one billion, two hundred two million, three hundred ninety-two thousand, thirteen".