122110999981 has 2 divisors, whose sum is σ = 122110999982. Its totient is φ = 122110999980.

The previous prime is 122110999979. The next prime is 122111000009. The reversal of 122110999981 is 189999011221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80389260900 + 41721739081 = 283530^2 + 204259^2 .

It is a cyclic number.

It is not a de Polignac number, because 122110999981 - 2¹ = 122110999979 is a prime.

It is a super-2 number, since 2×122110999981² (a number of 23 digits) contains 22 as substring.

Together with 122110999979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122110999921) 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 as a sum of consecutive naturals, namely, 61055499990 + 61055499991.

It is an arithmetic number, because the mean of its divisors is an integer number (61055499991).

Almost surely, 2^122110999981 is an apocalyptic number.

It is an amenable number.

122110999981 is a deficient number, since it is larger than the sum of its proper divisors (1).

122110999981 is an equidigital number, since it uses as much as digits as its factorization.

122110999981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 52.

The spelling of 122110999981 in words is "one hundred twenty-two billion, one hundred ten million, nine hundred ninety-nine thousand, nine hundred eighty-one".