31322020211221 has 2 divisors, whose sum is σ = 31322020211222. Its totient is φ = 31322020211220.

The previous prime is 31322020211117. The next prime is 31322020211231. The reversal of 31322020211221 is 12211202022313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23461768750225 + 7860251460996 = 4843735^2 + 2803614^2 .

It is a cyclic number.

It is not a de Polignac number, because 31322020211221 - 2¹⁷ = 31322020080149 is a prime.

It is a super-2 number, since 2×31322020211221² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31322020211192 and 31322020211201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31322020211231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15661010105610 + 15661010105611.

It is an arithmetic number, because the mean of its divisors is an integer number (15661010105611).

Almost surely, 2^{31322020211221} is an apocalyptic number.

It is an amenable number.

31322020211221 is a deficient number, since it is larger than the sum of its proper divisors (1).

31322020211221 is an equidigital number, since it uses as much as digits as its factorization.

31322020211221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 31322020211221 its reverse (12211202022313), we get a palindrome (43533222233534).

The spelling of 31322020211221 in words is "thirty-one trillion, three hundred twenty-two billion, twenty million, two hundred eleven thousand, two hundred twenty-one".