20111122091 has 2 divisors, whose sum is σ = 20111122092. Its totient is φ = 20111122090.

The previous prime is 20111122081. The next prime is 20111122123. The reversal of 20111122091 is 19022111102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20111122091 - 2¹⁰ = 20111121067 is a prime.

It is not a weakly prime, because it can be changed into another prime (20111122021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055561045 + 10055561046.

It is an arithmetic number, because the mean of its divisors is an integer number (10055561046).

Almost surely, 2^20111122091 is an apocalyptic number.

20111122091 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111122091 is an equidigital number, since it uses as much as digits as its factorization.

20111122091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 20.

Adding to 20111122091 its reverse (19022111102), we get a palindrome (39133233193).

The spelling of 20111122091 in words is "twenty billion, one hundred eleven million, one hundred twenty-two thousand, ninety-one".