21814086 has 16 divisors (see below), whose sum is σ = 49860864. Its totient is φ = 6232584.

The previous prime is 21814073. The next prime is 21814087. The reversal of 21814086 is 68041812.

It is a super-3 number, since 3×21814086³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21814087) by changing a digit.

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, 259650 + ... + 259733.

It is an arithmetic number, because the mean of its divisors is an integer number (3116304).

Almost surely, 2^21814086 is an apocalyptic number.

21814086 is an abundant number, since it is smaller than the sum of its proper divisors (28046778).

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

21814086 is a wasteful number, since it uses less digits than its factorization.

21814086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519395.

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 21814086 is about 4670.5552132482. Note that the first 3 decimals coincide. The cubic root of 21814086 is about 279.4123986889.

Adding to 21814086 its reverse (68041812), we get a palindrome (89855898).

The spelling of 21814086 in words is "twenty-one million, eight hundred fourteen thousand, eighty-six".