1204431097721 has 2 divisors, whose sum is σ = 1204431097722. Its totient is φ = 1204431097720.

The previous prime is 1204431097711. The next prime is 1204431097729. The reversal of 1204431097721 is 1277901344021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1204262617321 + 168480400 = 1097389^2 + 12980^2 .

It is a cyclic number.

It is not a de Polignac number, because 1204431097721 - 2³⁸ = 929553190777 is a prime.

It is not a weakly prime, because it can be changed into another prime (1204431097729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602215548860 + 602215548861.

It is an arithmetic number, because the mean of its divisors is an integer number (602215548861).

Almost surely, 2^{1204431097721} is an apocalyptic number.

It is an amenable number.

1204431097721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1204431097721 is an equidigital number, since it uses as much as digits as its factorization.

1204431097721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 41.

The spelling of 1204431097721 in words is "one trillion, two hundred four billion, four hundred thirty-one million, ninety-seven thousand, seven hundred twenty-one".