1231742363221 has 2 divisors, whose sum is σ = 1231742363222. Its totient is φ = 1231742363220.

The previous prime is 1231742363207. The next prime is 1231742363231. The reversal of 1231742363221 is 1223632471321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1196890700625 + 34851662596 = 1094025^2 + 186686^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231742363221 - 2⁹ = 1231742362709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231742363231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615871181610 + 615871181611.

It is an arithmetic number, because the mean of its divisors is an integer number (615871181611).

Almost surely, 2^{1231742363221} is an apocalyptic number.

It is an amenable number.

1231742363221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231742363221 is an equidigital number, since it uses as much as digits as its factorization.

1231742363221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 37.

The spelling of 1231742363221 in words is "one trillion, two hundred thirty-one billion, seven hundred forty-two million, three hundred sixty-three thousand, two hundred twenty-one".