1231893272321 has 2 divisors, whose sum is σ = 1231893272322. Its totient is φ = 1231893272320.

The previous prime is 1231893272279. The next prime is 1231893272333. The reversal of 1231893272321 is 1232723981321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1186870798096 + 45022474225 = 1089436^2 + 212185^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231893272321 - 2⁶ = 1231893272257 is a prime.

It is a super-2 number, since 2×1231893272321² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1231893272341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615946636160 + 615946636161.

It is an arithmetic number, because the mean of its divisors is an integer number (615946636161).

Almost surely, 2^{1231893272321} is an apocalyptic number.

It is an amenable number.

1231893272321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231893272321 is an equidigital number, since it uses as much as digits as its factorization.

1231893272321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 44.

The spelling of 1231893272321 in words is "one trillion, two hundred thirty-one billion, eight hundred ninety-three million, two hundred seventy-two thousand, three hundred twenty-one".