13231421 has 6 divisors (see below), whose sum is σ = 15391710. Its totient is φ = 11341176.

The previous prime is 13231411. The next prime is 13231481. The reversal of 13231421 is 12413231.

13231421 = 224² + 225² + ... + 370².

It can be written as a sum of positive squares in only one way, i.e., 11764900 + 1466521 = 3430^2 + 1211^2 .

It is not a de Polignac number, because 13231421 - 2⁶ = 13231357 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 13231421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13231411) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 134966 + ... + 135063.

It is an arithmetic number, because the mean of its divisors is an integer number (2565285).

Almost surely, 2^13231421 is an apocalyptic number.

It is an amenable number.

13231421 is a deficient number, since it is larger than the sum of its proper divisors (2160289).

13231421 is an equidigital number, since it uses as much as digits as its factorization.

13231421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270043 (or 270036 counting only the distinct ones).

The product of its digits is 144, while the sum is 17.

The square root of 13231421 is about 3637.5020274908. The cubic root of 13231421 is about 236.5205223056.

Adding to 13231421 its reverse (12413231), we get a palindrome (25644652).

It can be divided in two parts, 1323 and 1421, that added together give a cube (2744 = 14³).

The spelling of 13231421 in words is "thirteen million, two hundred thirty-one thousand, four hundred twenty-one".