31320120022021 has 2 divisors, whose sum is σ = 31320120022022. Its totient is φ = 31320120022020.

The previous prime is 31320120022003. The next prime is 31320120022057. The reversal of 31320120022021 is 12022002102313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27367399480996 + 3952720541025 = 5231386^2 + 1988145^2 .

It is a cyclic number.

It is not a de Polignac number, because 31320120022021 - 2¹¹ = 31320120019973 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31320120022021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31320120722021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15660060011010 + 15660060011011.

It is an arithmetic number, because the mean of its divisors is an integer number (15660060011011).

Almost surely, 2^{31320120022021} is an apocalyptic number.

It is an amenable number.

31320120022021 is a deficient number, since it is larger than the sum of its proper divisors (1).

31320120022021 is an equidigital number, since it uses as much as digits as its factorization.

31320120022021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 31320120022021 its reverse (12022002102313), we get a palindrome (43342122124334).

The spelling of 31320120022021 in words is "thirty-one trillion, three hundred twenty billion, one hundred twenty million, twenty-two thousand, twenty-one".