21926085 has 16 divisors (see below), whose sum is σ = 35606976. Its totient is φ = 11518848.

The previous prime is 21926077. The next prime is 21926123. The reversal of 21926085 is 58062912.

It is not a de Polignac number, because 21926085 - 2³ = 21926077 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9904 + ... + 11913.

It is an arithmetic number, because the mean of its divisors is an integer number (2225436).

Almost surely, 2^21926085 is an apocalyptic number.

It is an amenable number.

21926085 is a deficient number, since it is larger than the sum of its proper divisors (13680891).

21926085 is a wasteful number, since it uses less digits than its factorization.

21926085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21892.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 21926085 is about 4682.5297649882. The cubic root of 21926085 is about 279.8897737904.

Adding to 21926085 its reverse (58062912), we get a palindrome (79988997).

The spelling of 21926085 in words is "twenty-one million, nine hundred twenty-six thousand, eighty-five".