1331312021 has 8 divisors (see below), whose sum is σ = 1437053184. Its totient is φ = 1226046960.

The previous prime is 1331311987. The next prime is 1331312033. The reversal of 1331312021 is 1202131331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1331312021 - 2²² = 1327117717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331312051) 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 in 7 ways as a sum of consecutive naturals, for example, 113201 + ... + 124406.

It is an arithmetic number, because the mean of its divisors is an integer number (179631648).

Almost surely, 2^1331312021 is an apocalyptic number.

It is an amenable number.

1331312021 is a deficient number, since it is larger than the sum of its proper divisors (105741163).

1331312021 is a wasteful number, since it uses less digits than its factorization.

1331312021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238051.

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

The square root of 1331312021 is about 36487.1487101966. The cubic root of 1331312021 is about 1100.0859494824.

Adding to 1331312021 its reverse (1202131331), we get a palindrome (2533443352).

The spelling of 1331312021 in words is "one billion, three hundred thirty-one million, three hundred twelve thousand, twenty-one".