231421 has 4 divisors (see below), whose sum is σ = 245052. Its totient is φ = 217792.

The previous prime is 231419. The next prime is 231431. The reversal of 231421 is 124132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 62500 + 168921 = 250^2 + 411^2 .

It is a cyclic number.

It is not a de Polignac number, because 231421 - 2¹ = 231419 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 (231431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6790 + ... + 6823.

It is an arithmetic number, because the mean of its divisors is an integer number (61263).

2²³¹⁴²¹ is an apocalyptic number.

It is an amenable number.

231421 is a deficient number, since it is larger than the sum of its proper divisors (13631).

231421 is a wasteful number, since it uses less digits than its factorization.

231421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13630.

The product of its digits is 48, while the sum is 13.

The square root of 231421 is about 481.0623660192. The cubic root of 231421 is about 61.3951769351.

Adding to 231421 its reverse (124132), we get a palindrome (355553).

It can be divided in two parts, 23 and 1421, that added together give a square (1444 = 38²).

The spelling of 231421 in words is "two hundred thirty-one thousand, four hundred twenty-one".