31221230212231 has 16 divisors (see below), whose sum is σ = 33753266494560. Its totient is φ = 28778103014400.

The previous prime is 31221230212217. The next prime is 31221230212261. The reversal of 31221230212231 is 13221203212213.

It is a cyclic number.

It is not a de Polignac number, because 31221230212231 - 2⁷ = 31221230212103 is a prime.

It is a super-2 number, since 2×31221230212231² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31221230212196 and 31221230212205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31221230212261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43795515 + ... + 44502691.

It is an arithmetic number, because the mean of its divisors is an integer number (2109579155910).

Almost surely, 2^{31221230212231} is an apocalyptic number.

31221230212231 is a deficient number, since it is larger than the sum of its proper divisors (2532036282329).

31221230212231 is a wasteful number, since it uses less digits than its factorization.

31221230212231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770034.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 31221230212231 its reverse (13221203212213), we get a palindrome (44442433424444).

The spelling of 31221230212231 in words is "thirty-one trillion, two hundred twenty-one billion, two hundred thirty million, two hundred twelve thousand, two hundred thirty-one".