21000223231297 has 16 divisors (see below), whose sum is σ = 21527771403600. Its totient is φ = 20473408834560.

The previous prime is 21000223231279. The next prime is 21000223231303. The reversal of 21000223231297 is 79213232200012.

It can be written as a sum of positive squares in 8 ways, for example, as 7004962662721 + 13995260568576 = 2646689^2 + 3741024^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21000223231297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000223231237) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1171290229 + ... + 1171308157.

It is an arithmetic number, because the mean of its divisors is an integer number (1345485712725).

Almost surely, 2^{21000223231297} is an apocalyptic number.

It is an amenable number.

21000223231297 is a deficient number, since it is larger than the sum of its proper divisors (527548172303).

21000223231297 is a wasteful number, since it uses less digits than its factorization.

21000223231297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36756.

The product of its (nonzero) digits is 18144, while the sum is 34.

The spelling of 21000223231297 in words is "twenty-one trillion, two hundred twenty-three million, two hundred thirty-one thousand, two hundred ninety-seven".