921021001311329 has 2 divisors, whose sum is σ = 921021001311330. Its totient is φ = 921021001311328.

The previous prime is 921021001311221. The next prime is 921021001311409. The reversal of 921021001311329 is 923113100120129.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 880928993480704 + 40092007830625 = 29680448^2 + 6331825^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-921021001311329 is a prime.

It is not a weakly prime, because it can be changed into another prime (921021001311529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460510500655664 + 460510500655665.

It is an arithmetic number, because the mean of its divisors is an integer number (460510500655665).

Almost surely, 2^{921021001311329} is an apocalyptic number.

It is an amenable number.

921021001311329 is a deficient number, since it is larger than the sum of its proper divisors (1).

921021001311329 is an equidigital number, since it uses as much as digits as its factorization.

921021001311329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 35.

The spelling of 921021001311329 in words is "nine hundred twenty-one trillion, twenty-one billion, one million, three hundred eleven thousand, three hundred twenty-nine".