231010221 has 16 divisors (see below), whose sum is σ = 332084480. Its totient is φ = 141998400.

The previous prime is 231010103. The next prime is 231010223. The reversal of 231010221 is 122010132.

It is not a de Polignac number, because 231010221 - 2¹⁰ = 231009197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231010197 and 231010206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231010223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37671 + ... + 43371.

It is an arithmetic number, because the mean of its divisors is an integer number (20755280).

Almost surely, 2^231010221 is an apocalyptic number.

It is an amenable number.

231010221 is a deficient number, since it is larger than the sum of its proper divisors (101074259).

231010221 is a wasteful number, since it uses less digits than its factorization.

231010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6756.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 231010221 is about 15199.0203960650. The cubic root of 231010221 is about 613.5882934625.

Adding to 231010221 its reverse (122010132), we get a palindrome (353020353).

The spelling of 231010221 in words is "two hundred thirty-one million, ten thousand, two hundred twenty-one".