21223614 has 8 divisors (see below), whose sum is σ = 42447240. Its totient is φ = 7074536.

The previous prime is 21223613. The next prime is 21223619. The reversal of 21223614 is 41632212.

It is a sphenic number, since it is the product of 3 distinct primes.

21223614 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1768629 + ... + 1768640.

It is an arithmetic number, because the mean of its divisors is an integer number (5305905).

Almost surely, 2^21223614 is an apocalyptic number.

21223614 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21223614 is a wasteful number, since it uses less digits than its factorization.

21223614 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3537274.

The product of its digits is 576, while the sum is 21.

The square root of 21223614 is about 4606.9093761436. The cubic root of 21223614 is about 276.8682226701.

Adding to 21223614 its reverse (41632212), we get a palindrome (62855826).

The spelling of 21223614 in words is "twenty-one million, two hundred twenty-three thousand, six hundred fourteen".