21842227 has 8 divisors (see below), whose sum is σ = 24164352. Its totient is φ = 19576200.

The previous prime is 21842221. The next prime is 21842239. The reversal of 21842227 is 72224812.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21842227 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21842195 and 21842204.

It is not an unprimeable number, because it can be changed into a prime (21842221) 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, 13203 + ... + 14764.

It is an arithmetic number, because the mean of its divisors is an integer number (3020544).

Almost surely, 2^21842227 is an apocalyptic number.

21842227 is a deficient number, since it is larger than the sum of its proper divisors (2322125).

21842227 is a wasteful number, since it uses less digits than its factorization.

21842227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28049.

The product of its digits is 3584, while the sum is 28.

The square root of 21842227 is about 4673.5668391497. The cubic root of 21842227 is about 279.5324979307.

It can be divided in two parts, 21 and 842227, that added together give a palindrome (842248).

The spelling of 21842227 in words is "twenty-one million, eight hundred forty-two thousand, two hundred twenty-seven".