1331336021 has 2 divisors, whose sum is σ = 1331336022. Its totient is φ = 1331336020.

The previous prime is 1331335987. The next prime is 1331336057. The reversal of 1331336021 is 1206331331.

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., 1046199025 + 285136996 = 32345^2 + 16886^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331336021 - 2¹⁴ = 1331319637 is a prime.

It is a super-2 number, since 2×1331336021² = 3544911201624224882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1331339021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665668010 + 665668011.

It is an arithmetic number, because the mean of its divisors is an integer number (665668011).

Almost surely, 2^1331336021 is an apocalyptic number.

It is an amenable number.

1331336021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331336021 is an equidigital number, since it uses as much as digits as its factorization.

1331336021 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.

The square root of 1331336021 is about 36487.4775916341. The cubic root of 1331336021 is about 1100.0925599799.

Adding to 1331336021 its reverse (1206331331), we get a palindrome (2537667352).

The spelling of 1331336021 in words is "one billion, three hundred thirty-one million, three hundred thirty-six thousand, twenty-one".