20011011022111 has 2 divisors, whose sum is σ = 20011011022112. Its totient is φ = 20011011022110.

The previous prime is 20011011022043. The next prime is 20011011022117. The reversal of 20011011022111 is 11122011011002.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20011011022111 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20011011022091 and 20011011022100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20011011022117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005505511055 + 10005505511056.

It is an arithmetic number, because the mean of its divisors is an integer number (10005505511056).

Almost surely, 2^{20011011022111} is an apocalyptic number.

20011011022111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011011022111 is an equidigital number, since it uses as much as digits as its factorization.

20011011022111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 20011011022111 its reverse (11122011011002), we get a palindrome (31133022033113).

The spelling of 20011011022111 in words is "twenty trillion, eleven billion, eleven million, twenty-two thousand, one hundred eleven".