231222121 has 8 divisors (see below), whose sum is σ = 253229760. Its totient is φ = 209817552.

The previous prime is 231222119. The next prime is 231222127. The reversal of 231222121 is 121222132.

It is a happy number.

231222121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 231222121 - 2¹ = 231222119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231222095 and 231222104.

It is not an unprimeable number, because it can be changed into a prime (231222127) 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, 149965 + ... + 151498.

It is an arithmetic number, because the mean of its divisors is an integer number (31653720).

Almost surely, 2^231222121 is an apocalyptic number.

It is an amenable number.

231222121 is a deficient number, since it is larger than the sum of its proper divisors (22007639).

231222121 is a wasteful number, since it uses less digits than its factorization.

231222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301535.

The product of its digits is 96, while the sum is 16.

The square root of 231222121 is about 15205.9896422430. The cubic root of 231222121 is about 613.7758459505.

Adding to 231222121 its reverse (121222132), we get a palindrome (352444253).

The spelling of 231222121 in words is "two hundred thirty-one million, two hundred twenty-two thousand, one hundred twenty-one".