20111121187 has 2 divisors, whose sum is σ = 20111121188. Its totient is φ = 20111121186.

The previous prime is 20111121181. The next prime is 20111121209. The reversal of 20111121187 is 78112111102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20111121187 - 2²⁷ = 19976903459 is a prime.

It is not a weakly prime, because it can be changed into another prime (20111121181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055560593 + 10055560594.

It is an arithmetic number, because the mean of its divisors is an integer number (10055560594).

Almost surely, 2^20111121187 is an apocalyptic number.

20111121187 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111121187 is an equidigital number, since it uses as much as digits as its factorization.

20111121187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 25.

Adding to 20111121187 its reverse (78112111102), we get a palindrome (98223232289).

The spelling of 20111121187 in words is "twenty billion, one hundred eleven million, one hundred twenty-one thousand, one hundred eighty-seven".