231131221210 has 16 divisors (see below), whose sum is σ = 418148060616. Its totient is φ = 91983185728.

The previous prime is 231131221207. The next prime is 231131221253. The reversal of 231131221210 is 12122131132.

It can be written as a sum of positive squares in 4 ways, for example, as 175233494881 + 55897726329 = 418609^2 + 236427^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58660777 + ... + 58664716.

Almost surely, 2^231131221210 is an apocalyptic number.

231131221210 is a deficient number, since it is larger than the sum of its proper divisors (187016839406).

231131221210 is a wasteful number, since it uses less digits than its factorization.

231131221210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117325697.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 231131221210 its reverse (12122131132), we get a palindrome (243253352342).

The spelling of 231131221210 in words is "two hundred thirty-one billion, one hundred thirty-one million, two hundred twenty-one thousand, two hundred ten".