20010011111 has 2 divisors, whose sum is σ = 20010011112. Its totient is φ = 20010011110.

The previous prime is 20010011089. The next prime is 20010011113. The reversal of 20010011111 is 11111001002.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20010011111 - 2²² = 20005816807 is a prime.

Together with 20010011113, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20010011113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005005555 + 10005005556.

It is an arithmetic number, because the mean of its divisors is an integer number (10005005556).

Almost surely, 2^20010011111 is an apocalyptic number.

20010011111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20010011111 is an equidigital number, since it uses as much as digits as its factorization.

20010011111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 20010011111 its reverse (11111001002), we get a palindrome (31121012113).

The spelling of 20010011111 in words is "twenty billion, ten million, eleven thousand, one hundred eleven".