1021813289281 has 2 divisors, whose sum is σ = 1021813289282. Its totient is φ = 1021813289280.

The previous prime is 1021813289267. The next prime is 1021813289291. The reversal of 1021813289281 is 1829823181201.

1021813289281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 526923551025 + 494889738256 = 725895^2 + 703484^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021813289281 - 2⁷ = 1021813289153 is a prime.

It is a super-2 number, since 2×1021813289281² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1021813289201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510906644640 + 510906644641.

It is an arithmetic number, because the mean of its divisors is an integer number (510906644641).

Almost surely, 2^{1021813289281} is an apocalyptic number.

It is an amenable number.

1021813289281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021813289281 is an equidigital number, since it uses as much as digits as its factorization.

1021813289281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 110592, while the sum is 46.

The spelling of 1021813289281 in words is "one trillion, twenty-one billion, eight hundred thirteen million, two hundred eighty-nine thousand, two hundred eighty-one".