1305264126421 has 2 divisors, whose sum is σ = 1305264126422. Its totient is φ = 1305264126420.

The previous prime is 1305264126409. The next prime is 1305264126457. The reversal of 1305264126421 is 1246214625031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1070924871025 + 234339255396 = 1034855^2 + 484086^2 .

It is a cyclic number.

It is not a de Polignac number, because 1305264126421 - 2³⁷ = 1167825172949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1305264126401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 652632063210 + 652632063211.

It is an arithmetic number, because the mean of its divisors is an integer number (652632063211).

Almost surely, 2^{1305264126421} is an apocalyptic number.

It is an amenable number.

1305264126421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1305264126421 is an equidigital number, since it uses as much as digits as its factorization.

1305264126421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 37.

The spelling of 1305264126421 in words is "one trillion, three hundred five billion, two hundred sixty-four million, one hundred twenty-six thousand, four hundred twenty-one".