20122042209991 has 2 divisors, whose sum is σ = 20122042209992. Its totient is φ = 20122042209990.

The previous prime is 20122042209989. The next prime is 20122042210009. The reversal of 20122042209991 is 19990224022102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20122042209991 - 2¹ = 20122042209989 is a prime.

Together with 20122042209989, 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 (20122042279991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061021104995 + 10061021104996.

It is an arithmetic number, because the mean of its divisors is an integer number (10061021104996).

Almost surely, 2^{20122042209991} is an apocalyptic number.

20122042209991 is a deficient number, since it is larger than the sum of its proper divisors (1).

20122042209991 is an equidigital number, since it uses as much as digits as its factorization.

20122042209991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 43.

The spelling of 20122042209991 in words is "twenty trillion, one hundred twenty-two billion, forty-two million, two hundred nine thousand, nine hundred ninety-one".