21110027 has 2 divisors, whose sum is σ = 21110028. Its totient is φ = 21110026.

The previous prime is 21109987. The next prime is 21110029. The reversal of 21110027 is 72001112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21110027 is a prime.

Together with 21110029, 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 = 21109993 and 21110020.

It is not a weakly prime, because it can be changed into another prime (21110029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555013 + 10555014.

It is an arithmetic number, because the mean of its divisors is an integer number (10555014).

Almost surely, 2^21110027 is an apocalyptic number.

21110027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110027 is an equidigital number, since it uses as much as digits as its factorization.

21110027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28, while the sum is 14.

The square root of 21110027 is about 4594.5649413193. The cubic root of 21110027 is about 276.3734137323.

Adding to 21110027 its reverse (72001112), we get a palindrome (93111139).

The spelling of 21110027 in words is "twenty-one million, one hundred ten thousand, twenty-seven".