21736085 has 8 divisors (see below), whose sum is σ = 29809536. Its totient is φ = 14904720.

The previous prime is 21736067. The next prime is 21736093. The reversal of 21736085 is 58063712.

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 21736085 - 2⁶ = 21736021 is a prime.

It is a super-2 number, since 2×21736085² = 944914782254450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 310481 + ... + 310550.

It is an arithmetic number, because the mean of its divisors is an integer number (3726192).

Almost surely, 2^21736085 is an apocalyptic number.

It is an amenable number.

21736085 is a deficient number, since it is larger than the sum of its proper divisors (8073451).

21736085 is an equidigital number, since it uses as much as digits as its factorization.

21736085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621043.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 21736085 is about 4662.1974432664. The cubic root of 21736085 is about 279.0789677251.

Adding to 21736085 its reverse (58063712), we get a palindrome (79799797).

The spelling of 21736085 in words is "twenty-one million, seven hundred thirty-six thousand, eighty-five".