20122111209973 has 2 divisors, whose sum is σ = 20122111209974. Its totient is φ = 20122111209972.

The previous prime is 20122111209971. The next prime is 20122111209989. The reversal of 20122111209973 is 37990211122102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14567336291524 + 5554774918449 = 3816718^2 + 2356857^2 .

It is a cyclic number.

It is not a de Polignac number, because 20122111209973 - 2¹ = 20122111209971 is a prime.

Together with 20122111209971, 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 (20122111209971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061055604986 + 10061055604987.

It is an arithmetic number, because the mean of its divisors is an integer number (10061055604987).

Almost surely, 2^{20122111209973} is an apocalyptic number.

It is an amenable number.

20122111209973 is a deficient number, since it is larger than the sum of its proper divisors (1).

20122111209973 is an equidigital number, since it uses as much as digits as its factorization.

20122111209973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 40.

The spelling of 20122111209973 in words is "twenty trillion, one hundred twenty-two billion, one hundred eleven million, two hundred nine thousand, nine hundred seventy-three".