21614223 has 8 divisors (see below), whose sum is σ = 29748736. Its totient is φ = 13944600.

The previous prime is 21614221. The next prime is 21614233. The reversal of 21614223 is 32241612.

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

It is not a de Polignac number, because 21614223 - 2¹ = 21614221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21614223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21614221) 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, 116113 + ... + 116298.

It is an arithmetic number, because the mean of its divisors is an integer number (3718592).

Almost surely, 2^21614223 is an apocalyptic number.

21614223 is a deficient number, since it is larger than the sum of its proper divisors (8134513).

21614223 is a wasteful number, since it uses less digits than its factorization.

21614223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232445.

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

The square root of 21614223 is about 4649.1099148117. The cubic root of 21614223 is about 278.5564437511.

Adding to 21614223 its reverse (32241612), we get a palindrome (53855835).

The spelling of 21614223 in words is "twenty-one million, six hundred fourteen thousand, two hundred twenty-three".