21085093 has 8 divisors (see below), whose sum is σ = 22036608. Its totient is φ = 20154624.

The previous prime is 21085091. The next prime is 21085109. The reversal of 21085093 is 39058012.

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 21085093 - 2¹ = 21085091 is a prime.

It is a super-2 number, since 2×21085093² = 889162293637298, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21085091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3196 + ... + 7237.

It is an arithmetic number, because the mean of its divisors is an integer number (2754576).

Almost surely, 2^21085093 is an apocalyptic number.

It is an amenable number.

21085093 is a deficient number, since it is larger than the sum of its proper divisors (951515).

21085093 is a wasteful number, since it uses less digits than its factorization.

21085093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10523.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 21085093 is about 4591.8507162145. The cubic root of 21085093 is about 276.2645585170.

The spelling of 21085093 in words is "twenty-one million, eighty-five thousand, ninety-three".