31202111222081 has 2 divisors, whose sum is σ = 31202111222082. Its totient is φ = 31202111222080.

The previous prime is 31202111222027. The next prime is 31202111222099. The reversal of 31202111222081 is 18022211120213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30137739346225 + 1064371875856 = 5489785^2 + 1031684^2 .

It is a cyclic number.

It is not a de Polignac number, because 31202111222081 - 2³⁸ = 30927233315137 is a prime.

It is a super-2 number, since 2×31202111222081² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31202111222081.

It is not a weakly prime, because it can be changed into another prime (31202111221081) 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 as a sum of consecutive naturals, namely, 15601055611040 + 15601055611041.

It is an arithmetic number, because the mean of its divisors is an integer number (15601055611041).

Almost surely, 2^{31202111222081} is an apocalyptic number.

It is an amenable number.

31202111222081 is a deficient number, since it is larger than the sum of its proper divisors (1).

31202111222081 is an equidigital number, since it uses as much as digits as its factorization.

31202111222081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 26.

Adding to 31202111222081 its reverse (18022211120213), we get a palindrome (49224322342294).

The spelling of 31202111222081 in words is "thirty-one trillion, two hundred two billion, one hundred eleven million, two hundred twenty-two thousand, eighty-one".