1331021323 has 4 divisors (see below), whose sum is σ = 1376918640. Its totient is φ = 1285124008.

The previous prime is 1331021303. The next prime is 1331021333. The reversal of 1331021323 is 3231201331.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1331021323 - 2¹⁷ = 1330890251 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1331021323.

It is not an unprimeable number, because it can be changed into a prime (1331021303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22948615 + ... + 22948672.

It is an arithmetic number, because the mean of its divisors is an integer number (344229660).

Almost surely, 2^1331021323 is an apocalyptic number.

1331021323 is a deficient number, since it is larger than the sum of its proper divisors (45897317).

1331021323 is an equidigital number, since it uses as much as digits as its factorization.

1331021323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45897316.

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

The square root of 1331021323 is about 36483.1649257572. The cubic root of 1331021323 is about 1100.0058740733.

Adding to 1331021323 its reverse (3231201331), we get a palindrome (4562222654).

The spelling of 1331021323 in words is "one billion, three hundred thirty-one million, twenty-one thousand, three hundred twenty-three".