1221002243441 has 2 divisors, whose sum is σ = 1221002243442. Its totient is φ = 1221002243440.

The previous prime is 1221002243437. The next prime is 1221002243453. The reversal of 1221002243441 is 1443422001221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 805326760000 + 415675483441 = 897400^2 + 644729^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221002243441 - 2² = 1221002243437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221002243441.

It is not a weakly prime, because it can be changed into another prime (1221002246441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610501121720 + 610501121721.

It is an arithmetic number, because the mean of its divisors is an integer number (610501121721).

Almost surely, 2^{1221002243441} is an apocalyptic number.

It is an amenable number.

1221002243441 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221002243441 is an equidigital number, since it uses as much as digits as its factorization.

1221002243441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 1221002243441 its reverse (1443422001221), we get a palindrome (2664424244662).

The spelling of 1221002243441 in words is "one trillion, two hundred twenty-one billion, two million, two hundred forty-three thousand, four hundred forty-one".