21683085 has 16 divisors (see below), whose sum is σ = 36519360. Its totient is φ = 10955520.

The previous prime is 21683071. The next prime is 21683087. The reversal of 21683085 is 58038612.

It is a happy number.

It is not a de Polignac number, because 21683085 - 2⁴ = 21683069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21683087) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37756 + ... + 38325.

It is an arithmetic number, because the mean of its divisors is an integer number (2282460).

Almost surely, 2^21683085 is an apocalyptic number.

It is an amenable number.

21683085 is a deficient number, since it is larger than the sum of its proper divisors (14836275).

21683085 is a wasteful number, since it uses less digits than its factorization.

21683085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76108.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 21683085 is about 4656.5099591862. The cubic root of 21683085 is about 278.8519531609.

It can be divided in two parts, 2168 and 3085, that added together give a triangular number (5253 = T₁₀₂).

The spelling of 21683085 in words is "twenty-one million, six hundred eighty-three thousand, eighty-five".