21736086 has 16 divisors (see below), whose sum is σ = 43518384. Its totient is φ = 7237664.

The previous prime is 21736067. The next prime is 21736093. The reversal of 21736086 is 68063712.

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, 8716 + ... + 10928.

It is an arithmetic number, because the mean of its divisors is an integer number (2719899).

Almost surely, 2^21736086 is an apocalyptic number.

21736086 is an abundant number, since it is smaller than the sum of its proper divisors (21782298).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21736086 is a wasteful number, since it uses less digits than its factorization.

21736086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3855.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 21736086 is about 4662.1975505120. The cubic root of 21736086 is about 279.0789720049.

Adding to 21736086 its reverse (68063712), we get a palindrome (89799798).

The spelling of 21736086 in words is "twenty-one million, seven hundred thirty-six thousand, eighty-six".