1232020131721 has 2 divisors, whose sum is σ = 1232020131722. Its totient is φ = 1232020131720.

The previous prime is 1232020131703. The next prime is 1232020131731. The reversal of 1232020131721 is 1271310202321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 968403605625 + 263616526096 = 984075^2 + 513436^2 .

It is a cyclic number.

It is not a de Polignac number, because 1232020131721 - 2²³ = 1232011743113 is a prime.

It is not a weakly prime, because it can be changed into another prime (1232020131731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 616010065860 + 616010065861.

It is an arithmetic number, because the mean of its divisors is an integer number (616010065861).

Almost surely, 2^{1232020131721} is an apocalyptic number.

It is an amenable number.

1232020131721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1232020131721 is an equidigital number, since it uses as much as digits as its factorization.

1232020131721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 25.

The spelling of 1232020131721 in words is "one trillion, two hundred thirty-two billion, twenty million, one hundred thirty-one thousand, seven hundred twenty-one".