20011202111 has 2 divisors, whose sum is σ = 20011202112. Its totient is φ = 20011202110.

The previous prime is 20011202087. The next prime is 20011202177. The reversal of 20011202111 is 11120211002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20011202111 - 2²² = 20007007807 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20011202092 and 20011202101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20011202191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005601055 + 10005601056.

It is an arithmetic number, because the mean of its divisors is an integer number (10005601056).

Almost surely, 2^20011202111 is an apocalyptic number.

20011202111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011202111 is an equidigital number, since it uses as much as digits as its factorization.

20011202111 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 11.

Adding to 20011202111 its reverse (11120211002), we get a palindrome (31131413113).

The spelling of 20011202111 in words is "twenty billion, eleven million, two hundred two thousand, one hundred eleven".