20102216111 has 2 divisors, whose sum is σ = 20102216112. Its totient is φ = 20102216110.

The previous prime is 20102216063. The next prime is 20102216137. The reversal of 20102216111 is 11161220102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20102216111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20102216111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20102216171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10051108055 + 10051108056.

It is an arithmetic number, because the mean of its divisors is an integer number (10051108056).

Almost surely, 2^20102216111 is an apocalyptic number.

20102216111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20102216111 is an equidigital number, since it uses as much as digits as its factorization.

20102216111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 20102216111 its reverse (11161220102), we get a palindrome (31263436213).

The spelling of 20102216111 in words is "twenty billion, one hundred two million, two hundred sixteen thousand, one hundred eleven".