1331442421 has 4 divisors (see below), whose sum is σ = 1331747872. Its totient is φ = 1331136972.

The previous prime is 1331442419. The next prime is 1331442443. The reversal of 1331442421 is 1242441331.

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.

It is a cyclic number.

It is not a de Polignac number, because 1331442421 - 2¹ = 1331442419 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 (1331442121) 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, 146091 + ... + 154936.

It is an arithmetic number, because the mean of its divisors is an integer number (332936968).

Almost surely, 2^1331442421 is an apocalyptic number.

It is an amenable number.

1331442421 is a deficient number, since it is larger than the sum of its proper divisors (305451).

1331442421 is an equidigital number, since it uses as much as digits as its factorization.

1331442421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305450.

The product of its digits is 2304, while the sum is 25.

The square root of 1331442421 is about 36488.9355969724. The cubic root of 1331442421 is about 1100.1218655618.

Adding to 1331442421 its reverse (1242441331), we get a palindrome (2573883752).

The spelling of 1331442421 in words is "one billion, three hundred thirty-one million, four hundred forty-two thousand, four hundred twenty-one".