31321211311221 has 24 divisors (see below), whose sum is σ = 45257953142880. Its totient is φ = 19258908042816.

The previous prime is 31321211311219. The next prime is 31321211311261. The reversal of 31321211311221 is 12211311212313.

It is not a de Polignac number, because 31321211311221 - 2¹ = 31321211311219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31321211311191 and 31321211311200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31321211311261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24510151 + ... + 25756356.

It is an arithmetic number, because the mean of its divisors is an integer number (1885748047620).

Almost surely, 2^{31321211311221} is an apocalyptic number.

It is an amenable number.

31321211311221 is a deficient number, since it is larger than the sum of its proper divisors (13936741831659).

31321211311221 is a wasteful number, since it uses less digits than its factorization.

31321211311221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50267765 (or 50267752 counting only the distinct ones).

The product of its digits is 432, while the sum is 24.

Adding to 31321211311221 its reverse (12211311212313), we get a palindrome (43532522523534).

The spelling of 31321211311221 in words is "thirty-one trillion, three hundred twenty-one billion, two hundred eleven million, three hundred eleven thousand, two hundred twenty-one".