231303031021 has 2 divisors, whose sum is σ = 231303031022. Its totient is φ = 231303031020.

The previous prime is 231303030977. The next prime is 231303031087. The reversal of 231303031021 is 120130303132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 227366848900 + 3936182121 = 476830^2 + 62739^2 .

It is a cyclic number.

It is not a de Polignac number, because 231303031021 - 2²¹ = 231300933869 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231303031021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231303031321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115651515510 + 115651515511.

It is an arithmetic number, because the mean of its divisors is an integer number (115651515511).

Almost surely, 2^231303031021 is an apocalyptic number.

It is an amenable number.

231303031021 is a deficient number, since it is larger than the sum of its proper divisors (1).

231303031021 is an equidigital number, since it uses as much as digits as its factorization.

231303031021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 231303031021 its reverse (120130303132), we get a palindrome (351433334153).

The spelling of 231303031021 in words is "two hundred thirty-one billion, three hundred three million, thirty-one thousand, twenty-one".