231320022002021 has 2 divisors, whose sum is σ = 231320022002022. Its totient is φ = 231320022002020.

The previous prime is 231320022001997. The next prime is 231320022002059. The reversal of 231320022002021 is 120200220023132.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 231319308364225 + 713637796 = 15209185^2 + 26714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231320022002021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231320022001984 and 231320022002002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231320022002921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115660011001010 + 115660011001011.

It is an arithmetic number, because the mean of its divisors is an integer number (115660011001011).

Almost surely, 2^{231320022002021} is an apocalyptic number.

It is an amenable number.

231320022002021 is a deficient number, since it is larger than the sum of its proper divisors (1).

231320022002021 is an equidigital number, since it uses as much as digits as its factorization.

231320022002021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 231320022002021 its reverse (120200220023132), we get a palindrome (351520242025153).

The spelling of 231320022002021 in words is "two hundred thirty-one trillion, three hundred twenty billion, twenty-two million, two thousand, twenty-one".