1331343421 has 4 divisors (see below), whose sum is σ = 1331663200. Its totient is φ = 1331023644.

The previous prime is 1331343367. The next prime is 1331343427. The reversal of 1331343421 is 1243431331.

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: 1243431331 = 383 ⋅3246557.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1331343421 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 (1331343427) 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 3 ways as a sum of consecutive naturals, for example, 153561 + ... + 161998.

It is an arithmetic number, because the mean of its divisors is an integer number (332915800).

Almost surely, 2^1331343421 is an apocalyptic number.

It is an amenable number.

1331343421 is a deficient number, since it is larger than the sum of its proper divisors (319779).

1331343421 is an equidigital number, since it uses as much as digits as its factorization.

1331343421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319778.

The product of its digits is 2592, while the sum is 25.

The square root of 1331343421 is about 36487.5789961461. The cubic root of 1331343421 is about 1100.0945982006.

Adding to 1331343421 its reverse (1243431331), we get a palindrome (2574774752).

The spelling of 1331343421 in words is "one billion, three hundred thirty-one million, three hundred forty-three thousand, four hundred twenty-one".