31232134212221 has 16 divisors (see below), whose sum is σ = 32486517668160. Its totient is φ = 29989674624000.

The previous prime is 31232134212217. The next prime is 31232134212269. The reversal of 31232134212221 is 12221243123213.

It is a cyclic number.

It is not a de Polignac number, because 31232134212221 - 2² = 31232134212217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31232134212281) 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, 17337626 + ... + 19054068.

It is an arithmetic number, because the mean of its divisors is an integer number (2030407354260).

Almost surely, 2^{31232134212221} is an apocalyptic number.

It is an amenable number.

31232134212221 is a deficient number, since it is larger than the sum of its proper divisors (1254383455939).

31232134212221 is a wasteful number, since it uses less digits than its factorization.

31232134212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1719916.

The product of its digits is 6912, while the sum is 29.

Adding to 31232134212221 its reverse (12221243123213), we get a palindrome (43453377335434).

The spelling of 31232134212221 in words is "thirty-one trillion, two hundred thirty-two billion, one hundred thirty-four million, two hundred twelve thousand, two hundred twenty-one".