1021645563137 has 2 divisors, whose sum is σ = 1021645563138. Its totient is φ = 1021645563136.

The previous prime is 1021645563091. The next prime is 1021645563209. The reversal of 1021645563137 is 7313655461201.

1021645563137 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 540466106896 + 481179456241 = 735164^2 + 693671^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021645563137 - 2²² = 1021641368833 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021645562137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510822781568 + 510822781569.

It is an arithmetic number, because the mean of its divisors is an integer number (510822781569).

Almost surely, 2^{1021645563137} is an apocalyptic number.

It is an amenable number.

1021645563137 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021645563137 is an equidigital number, since it uses as much as digits as its factorization.

1021645563137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 453600, while the sum is 44.

The spelling of 1021645563137 in words is "one trillion, twenty-one billion, six hundred forty-five million, five hundred sixty-three thousand, one hundred thirty-seven".