1331233421 has 8 divisors (see below), whose sum is σ = 1552459200. Its totient is φ = 1141056924.

The previous prime is 1331233391. The next prime is 1331233427. The reversal of 1331233421 is 1243321331.

It is not a de Polignac number, because 1331233421 - 2⁶ = 1331233357 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 (1331233427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1940231 + ... + 1940916.

It is an arithmetic number, because the mean of its divisors is an integer number (194057400).

Almost surely, 2^1331233421 is an apocalyptic number.

It is an amenable number.

1331233421 is a deficient number, since it is larger than the sum of its proper divisors (221225779).

1331233421 is an frugal number, since it uses more digits than its factorization.

1331233421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3881168 (or 3881154 counting only the distinct ones).

The product of its digits is 1296, while the sum is 23.

The square root of 1331233421 is about 36486.0716027363. The cubic root of 1331233421 is about 1100.0642995471.

Adding to 1331233421 its reverse (1243321331), we get a palindrome (2574554752).

The spelling of 1331233421 in words is "one billion, three hundred thirty-one million, two hundred thirty-three thousand, four hundred twenty-one".