21236086 has 16 divisors (see below), whose sum is σ = 32292000. Its totient is φ = 10473408.

The previous prime is 21236063. The next prime is 21236087. The reversal of 21236086 is 68063212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21236087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91026 + ... + 91258.

It is an arithmetic number, because the mean of its divisors is an integer number (2018250).

Almost surely, 2^21236086 is an apocalyptic number.

21236086 is a deficient number, since it is larger than the sum of its proper divisors (11055914).

21236086 is a wasteful number, since it uses less digits than its factorization.

21236086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 21236086 is about 4608.2627963257. The cubic root of 21236086 is about 276.9224456736.

Adding to 21236086 its reverse (68063212), we get a palindrome (89299298).

The spelling of 21236086 in words is "twenty-one million, two hundred thirty-six thousand, eighty-six".