31232133221 has 2 divisors, whose sum is σ = 31232133222. Its totient is φ = 31232133220.

The previous prime is 31232133217. The next prime is 31232133241. The reversal of 31232133221 is 12233123213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28094452996 + 3137680225 = 167614^2 + 56015^2 .

It is a cyclic number.

It is not a de Polignac number, because 31232133221 - 2² = 31232133217 is a prime.

It is a super-2 number, since 2×31232133221² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31232133211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15616066610 + 15616066611.

It is an arithmetic number, because the mean of its divisors is an integer number (15616066611).

Almost surely, 2^31232133221 is an apocalyptic number.

It is an amenable number.

31232133221 is a deficient number, since it is larger than the sum of its proper divisors (1).

31232133221 is an equidigital number, since it uses as much as digits as its factorization.

31232133221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 23.

Adding to 31232133221 its reverse (12233123213), we get a palindrome (43465256434).

The spelling of 31232133221 in words is "thirty-one billion, two hundred thirty-two million, one hundred thirty-three thousand, two hundred twenty-one".