21214086 has 16 divisors (see below), whose sum is σ = 42841344. Its totient is φ = 7002504.

The previous prime is 21214049. The next prime is 21214087. The reversal of 21214086 is 68041212.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214087) 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, 16546 + ... + 17781.

It is an arithmetic number, because the mean of its divisors is an integer number (2677584).

Almost surely, 2^21214086 is an apocalyptic number.

21214086 is an abundant number, since it is smaller than the sum of its proper divisors (21627258).

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

21214086 is a wasteful number, since it uses less digits than its factorization.

21214086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34435.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 21214086 is about 4605.8751611393. The cubic root of 21214086 is about 276.8267846240.

Adding to 21214086 its reverse (68041212), we get a palindrome (89255298).

It can be divided in two parts, 212140 and 86, that added together give a triangular number (212226 = T₆₅₁).

The spelling of 21214086 in words is "twenty-one million, two hundred fourteen thousand, eighty-six".