231431222212 has 6 divisors (see below), whose sum is σ = 405004638878. Its totient is φ = 115715611104.

The previous prime is 231431222201. The next prime is 231431222227. The reversal of 231431222212 is 212222134132.

It can be written as a sum of positive squares in only one way, i.e., 177591445056 + 53839777156 = 421416^2 + 232034^2 .

It is a super-2 number, since 2×231431222212² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28928902773 + ... + 28928902780.

Almost surely, 2^231431222212 is an apocalyptic number.

It is an amenable number.

231431222212 is a deficient number, since it is larger than the sum of its proper divisors (173573416666).

231431222212 is a wasteful number, since it uses less digits than its factorization.

231431222212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57857805557 (or 57857805555 counting only the distinct ones).

The product of its digits is 2304, while the sum is 25.

Adding to 231431222212 its reverse (212222134132), we get a palindrome (443653356344).

The spelling of 231431222212 in words is "two hundred thirty-one billion, four hundred thirty-one million, two hundred twenty-two thousand, two hundred twelve".