1331331203021 has 2 divisors, whose sum is σ = 1331331203022. Its totient is φ = 1331331203020.

The previous prime is 1331331203017. The next prime is 1331331203039. The reversal of 1331331203021 is 1203021331331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1036753640521 + 294577562500 = 1018211^2 + 542750^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331331203021 - 2² = 1331331203017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1331331233021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665665601510 + 665665601511.

It is an arithmetic number, because the mean of its divisors is an integer number (665665601511).

Almost surely, 2^{1331331203021} is an apocalyptic number.

It is an amenable number.

1331331203021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331331203021 is an equidigital number, since it uses as much as digits as its factorization.

1331331203021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 23.

Adding to 1331331203021 its reverse (1203021331331), we get a palindrome (2534352534352).

The spelling of 1331331203021 in words is "one trillion, three hundred thirty-one billion, three hundred thirty-one million, two hundred three thousand, twenty-one".