1323131000021 has 2 divisors, whose sum is σ = 1323131000022. Its totient is φ = 1323131000020.

The previous prime is 1323131000011. The next prime is 1323131000057. The reversal of 1323131000021 is 1200001313231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 695407555921 + 627723444100 = 833911^2 + 792290^2 .

It is a cyclic number.

It is not a de Polignac number, because 1323131000021 - 2²⁶ = 1323063891157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1323131000011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661565500010 + 661565500011.

It is an arithmetic number, because the mean of its divisors is an integer number (661565500011).

Almost surely, 2^{1323131000021} is an apocalyptic number.

It is an amenable number.

1323131000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1323131000021 is an equidigital number, since it uses as much as digits as its factorization.

1323131000021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 1323131000021 its reverse (1200001313231), we get a palindrome (2523132313252).

The spelling of 1323131000021 in words is "one trillion, three hundred twenty-three billion, one hundred thirty-one million, twenty-one", and thus it is an aban number.