21120200111 has 2 divisors, whose sum is σ = 21120200112. Its totient is φ = 21120200110.

The previous prime is 21120200077. The next prime is 21120200113. The reversal of 21120200111 is 11100202112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21120200111 - 2¹⁴ = 21120183727 is a prime.

Together with 21120200113, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21120200092 and 21120200101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21120200113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560100055 + 10560100056.

It is an arithmetic number, because the mean of its divisors is an integer number (10560100056).

Almost surely, 2^21120200111 is an apocalyptic number.

21120200111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120200111 is an equidigital number, since it uses as much as digits as its factorization.

21120200111 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 21120200111 its reverse (11100202112), we get a palindrome (32220402223).

The spelling of 21120200111 in words is "twenty-one billion, one hundred twenty million, two hundred thousand, one hundred eleven".