231434221 has 4 divisors (see below), whose sum is σ = 232609212. Its totient is φ = 230259232.

The previous prime is 231434179. The next prime is 231434233. The reversal of 231434221 is 122434132.

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 110544196 + 120890025 = 10514^2 + 10995^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231434221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231434192 and 231434201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231434321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 587200 + ... + 587593.

It is an arithmetic number, because the mean of its divisors is an integer number (58152303).

Almost surely, 2^231434221 is an apocalyptic number.

It is an amenable number.

231434221 is a deficient number, since it is larger than the sum of its proper divisors (1174991).

231434221 is a wasteful number, since it uses less digits than its factorization.

231434221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1174990.

The product of its digits is 1152, while the sum is 22.

The square root of 231434221 is about 15212.9622690652. The cubic root of 231434221 is about 613.9634607447.

Adding to 231434221 its reverse (122434132), we get a palindrome (353868353).

The spelling of 231434221 in words is "two hundred thirty-one million, four hundred thirty-four thousand, two hundred twenty-one".