1021715251268 has 6 divisors (see below), whose sum is σ = 1788001689726. Its totient is φ = 510857625632.

The previous prime is 1021715251247. The next prime is 1021715251273. The reversal of 1021715251268 is 8621525171201.

It can be written as a sum of positive squares in only one way, i.e., 678040258624 + 343674992644 = 823432^2 + 586238^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127714406405 + ... + 127714406412.

It is an arithmetic number, because the mean of its divisors is an integer number (298000281621).

Almost surely, 2^{1021715251268} is an apocalyptic number.

It is an amenable number.

1021715251268 is a deficient number, since it is larger than the sum of its proper divisors (766286438458).

1021715251268 is a wasteful number, since it uses less digits than its factorization.

1021715251268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255428812821 (or 255428812819 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 41.

The spelling of 1021715251268 in words is "one trillion, twenty-one billion, seven hundred fifteen million, two hundred fifty-one thousand, two hundred sixty-eight".