231121321 has 8 divisors (see below), whose sum is σ = 233016264. Its totient is φ = 229234560.

The previous prime is 231121309. The next prime is 231121327. The reversal of 231121321 is 123121132.

231121321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 17640000 + 213481321 = 4200^2 + 14611^2 .

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 231121321 - 2⁷ = 231121193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231121295 and 231121304.

It is not an unprimeable number, because it can be changed into a prime (231121327) 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, 62751 + ... + 66331.

It is an arithmetic number, because the mean of its divisors is an integer number (29127033).

Almost surely, 2^231121321 is an apocalyptic number.

It is an amenable number.

231121321 is a deficient number, since it is larger than the sum of its proper divisors (1894943).

231121321 is a wasteful number, since it uses less digits than its factorization.

231121321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4091.

The product of its digits is 72, while the sum is 16.

The square root of 231121321 is about 15202.6747975480. The cubic root of 231121321 is about 613.6866422625.

Adding to 231121321 its reverse (123121132), we get a palindrome (354242453).

It can be divided in two parts, 2311 and 21321, that added together give a palindrome (23632).

The spelling of 231121321 in words is "two hundred thirty-one million, one hundred twenty-one thousand, three hundred twenty-one".