1294315015921 has 2 divisors, whose sum is σ = 1294315015922. Its totient is φ = 1294315015920.

The previous prime is 1294315015913. The next prime is 1294315015933. The reversal of 1294315015921 is 1295105134921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 845195229025 + 449119786896 = 919345^2 + 670164^2 .

It is a cyclic number.

It is not a de Polignac number, because 1294315015921 - 2³ = 1294315015913 is a prime.

It is not a weakly prime, because it can be changed into another prime (1294315015991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 647157507960 + 647157507961.

It is an arithmetic number, because the mean of its divisors is an integer number (647157507961).

Almost surely, 2^{1294315015921} is an apocalyptic number.

It is an amenable number.

1294315015921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1294315015921 is an equidigital number, since it uses as much as digits as its factorization.

1294315015921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97200, while the sum is 43.

The spelling of 1294315015921 in words is "one trillion, two hundred ninety-four billion, three hundred fifteen million, fifteen thousand, nine hundred twenty-one".