1255996980421 has 2 divisors, whose sum is σ = 1255996980422. Its totient is φ = 1255996980420.

The previous prime is 1255996980401. The next prime is 1255996980461. The reversal of 1255996980421 is 1240896995521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 945843777025 + 310153203396 = 972545^2 + 556914^2 .

It is a cyclic number.

It is not a de Polignac number, because 1255996980421 - 2²⁵ = 1255963425989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1255996980421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1255996980401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627998490210 + 627998490211.

It is an arithmetic number, because the mean of its divisors is an integer number (627998490211).

Almost surely, 2^{1255996980421} is an apocalyptic number.

It is an amenable number.

1255996980421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1255996980421 is an equidigital number, since it uses as much as digits as its factorization.

1255996980421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13996800, while the sum is 61.

The spelling of 1255996980421 in words is "one trillion, two hundred fifty-five billion, nine hundred ninety-six million, nine hundred eighty thousand, four hundred twenty-one".