21385111 has 8 divisors (see below), whose sum is σ = 23474304. Its totient is φ = 19320120.

The previous prime is 21385109. The next prime is 21385123. The reversal of 21385111 is 11158312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21385111 - 2¹ = 21385109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21385181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4171 + ... + 7756.

It is an arithmetic number, because the mean of its divisors is an integer number (2934288).

Almost surely, 2^21385111 is an apocalyptic number.

21385111 is a deficient number, since it is larger than the sum of its proper divisors (2089193).

21385111 is a wasteful number, since it uses less digits than its factorization.

21385111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12101.

The product of its digits is 240, while the sum is 22.

The square root of 21385111 is about 4624.4038534713. The cubic root of 21385111 is about 277.5687073871.

The spelling of 21385111 in words is "twenty-one million, three hundred eighty-five thousand, one hundred eleven".