31232230221 has 16 divisors (see below), whose sum is σ = 44225794368. Its totient is φ = 19537478400.

The previous prime is 31232230199. The next prime is 31232230241. The reversal of 31232230221 is 12203223213.

It is a happy number.

It is not a de Polignac number, because 31232230221 - 2⁶ = 31232230157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31232230241) 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, 908190 + ... + 941951.

It is an arithmetic number, because the mean of its divisors is an integer number (2764112148).

Almost surely, 2^31232230221 is an apocalyptic number.

It is an amenable number.

31232230221 is a deficient number, since it is larger than the sum of its proper divisors (12993564147).

31232230221 is a wasteful number, since it uses less digits than its factorization.

31232230221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1850492.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 31232230221 its reverse (12203223213), we get a palindrome (43435453434).

The spelling of 31232230221 in words is "thirty-one billion, two hundred thirty-two million, two hundred thirty thousand, two hundred twenty-one".