21112085 has 8 divisors (see below), whose sum is σ = 26151936. Its totient is φ = 16344720.

The previous prime is 21112081. The next prime is 21112093. The reversal of 21112085 is 58021112.

It is a happy number.

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

It is not a de Polignac number, because 21112085 - 2² = 21112081 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 (21112081) 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, 67949 + ... + 68258.

It is an arithmetic number, because the mean of its divisors is an integer number (3268992).

Almost surely, 2^21112085 is an apocalyptic number.

It is an amenable number.

21112085 is a deficient number, since it is larger than the sum of its proper divisors (5039851).

21112085 is a wasteful number, since it uses less digits than its factorization.

21112085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136243.

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 21112085 is about 4594.7888961300. The cubic root of 21112085 is about 276.3823945830.

Adding to 21112085 its reverse (58021112), we get a palindrome (79133197).

The spelling of 21112085 in words is "twenty-one million, one hundred twelve thousand, eighty-five".