21094111 has 2 divisors, whose sum is σ = 21094112. Its totient is φ = 21094110.

The previous prime is 21094109. The next prime is 21094133. The reversal of 21094111 is 11149012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21094111 - 2¹ = 21094109 is a prime.

Together with 21094109, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21094511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10547055 + 10547056.

It is an arithmetic number, because the mean of its divisors is an integer number (10547056).

Almost surely, 2^21094111 is an apocalyptic number.

21094111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21094111 is an equidigital number, since it uses as much as digits as its factorization.

21094111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 21094111 is about 4592.8325682524. The cubic root of 21094111 is about 276.3039386087.

The spelling of 21094111 in words is "twenty-one million, ninety-four thousand, one hundred eleven".