20122109989 has 2 divisors, whose sum is σ = 20122109990. Its totient is φ = 20122109988.

The previous prime is 20122109957. The next prime is 20122110049. The reversal of 20122109989 is 98990122102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15118669764 + 5003440225 = 122958^2 + 70735^2 .

It is a cyclic number.

It is not a de Polignac number, because 20122109989 - 2⁵ = 20122109957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20122109939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061054994 + 10061054995.

It is an arithmetic number, because the mean of its divisors is an integer number (10061054995).

Almost surely, 2^20122109989 is an apocalyptic number.

It is an amenable number.

20122109989 is a deficient number, since it is larger than the sum of its proper divisors (1).

20122109989 is an equidigital number, since it uses as much as digits as its factorization.

20122109989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 43.

The spelling of 20122109989 in words is "twenty billion, one hundred twenty-two million, one hundred nine thousand, nine hundred eighty-nine".