31321220212221 has 16 divisors (see below), whose sum is σ = 42350092300800. Its totient is φ = 20586584597040.

The previous prime is 31321220212187. The next prime is 31321220212229. The reversal of 31321220212221 is 12221202212313.

It is not a de Polignac number, because 31321220212221 - 2⁹ = 31321220211709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31321220212191 and 31321220212200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31321220212229) 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, 41136246 + ... + 41890728.

It is an arithmetic number, because the mean of its divisors is an integer number (2646880768800).

Almost surely, 2^{31321220212221} is an apocalyptic number.

It is an amenable number.

31321220212221 is a deficient number, since it is larger than the sum of its proper divisors (11028872088579).

31321220212221 is a wasteful number, since it uses less digits than its factorization.

31321220212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 949456.

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 31321220212221 its reverse (12221202212313), we get a palindrome (43542422424534).

The spelling of 31321220212221 in words is "thirty-one trillion, three hundred twenty-one billion, two hundred twenty million, two hundred twelve thousand, two hundred twenty-one".