1331242321 has 4 divisors (see below), whose sum is σ = 1341724672. Its totient is φ = 1320759972.

The previous prime is 1331242309. The next prime is 1331242357. The reversal of 1331242321 is 1232421331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1232421331 = 2963 ⋅415937.

It is a cyclic number.

It is not a de Polignac number, because 1331242321 - 2⁹ = 1331241809 is a prime.

It is a super-2 number, since 2×1331242321² = 3544412234442934082, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1331242292 and 1331242301.

It is not an unprimeable number, because it can be changed into a prime (1331242301) 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, 5240985 + ... + 5241238.

It is an arithmetic number, because the mean of its divisors is an integer number (335431168).

Almost surely, 2^1331242321 is an apocalyptic number.

It is an amenable number.

1331242321 is a deficient number, since it is larger than the sum of its proper divisors (10482351).

1331242321 is a wasteful number, since it uses less digits than its factorization.

1331242321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10482350.

The product of its digits is 864, while the sum is 22.

The square root of 1331242321 is about 36486.1935668823. The cubic root of 1331242321 is about 1100.0667510457.

Adding to 1331242321 its reverse (1232421331), we get a palindrome (2563663652).

The spelling of 1331242321 in words is "one billion, three hundred thirty-one million, two hundred forty-two thousand, three hundred twenty-one".