1021201215913 has 2 divisors, whose sum is σ = 1021201215914. Its totient is φ = 1021201215912.

The previous prime is 1021201215893. The next prime is 1021201215919. The reversal of 1021201215913 is 3195121021201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 971145208089 + 50056007824 = 985467^2 + 223732^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021201215913 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021201215919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510600607956 + 510600607957.

It is an arithmetic number, because the mean of its divisors is an integer number (510600607957).

Almost surely, 2^{1021201215913} is an apocalyptic number.

It is an amenable number.

1021201215913 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021201215913 is an equidigital number, since it uses as much as digits as its factorization.

1021201215913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 28.

The spelling of 1021201215913 in words is "one trillion, twenty-one billion, two hundred one million, two hundred fifteen thousand, nine hundred thirteen".