1221002243413 has 2 divisors, whose sum is σ = 1221002243414. Its totient is φ = 1221002243412.

The previous prime is 1221002243327. The next prime is 1221002243437. The reversal of 1221002243413 is 3143422001221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1217065684849 + 3936558564 = 1103207^2 + 62742^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221002243413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221002243453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610501121706 + 610501121707.

It is an arithmetic number, because the mean of its divisors is an integer number (610501121707).

Almost surely, 2^{1221002243413} is an apocalyptic number.

It is an amenable number.

1221002243413 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221002243413 is an equidigital number, since it uses as much as digits as its factorization.

1221002243413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 1221002243413 its reverse (3143422001221), we get a palindrome (4364424244634).

The spelling of 1221002243413 in words is "one trillion, two hundred twenty-one billion, two million, two hundred forty-three thousand, four hundred thirteen".