1304400120421 has 2 divisors, whose sum is σ = 1304400120422. Its totient is φ = 1304400120420.

The previous prime is 1304400120379. The next prime is 1304400120509. The reversal of 1304400120421 is 1240210044031.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 773995252900 + 530404867521 = 879770^2 + 728289^2 .

It is a cyclic number.

It is not a de Polignac number, because 1304400120421 - 2⁷ = 1304400120293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1304400120392 and 1304400120401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1304400123421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 652200060210 + 652200060211.

It is an arithmetic number, because the mean of its divisors is an integer number (652200060211).

Almost surely, 2^{1304400120421} is an apocalyptic number.

It is an amenable number.

1304400120421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1304400120421 is an equidigital number, since it uses as much as digits as its factorization.

1304400120421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 1304400120421 its reverse (1240210044031), we get a palindrome (2544610164452).

The spelling of 1304400120421 in words is "one trillion, three hundred four billion, four hundred million, one hundred twenty thousand, four hundred twenty-one".