21847222 has 4 divisors (see below), whose sum is σ = 32770836. Its totient is φ = 10923610.

The previous prime is 21847201. The next prime is 21847223. The reversal of 21847222 is 22274812.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×21847222² = 954602218234568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21847223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5461804 + ... + 5461807.

It is an arithmetic number, because the mean of its divisors is an integer number (8192709).

Almost surely, 2^21847222 is an apocalyptic number.

21847222 is a deficient number, since it is larger than the sum of its proper divisors (10923614).

21847222 is a wasteful number, since it uses less digits than its factorization.

21847222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10923613.

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

The square root of 21847222 is about 4674.1011970217. The cubic root of 21847222 is about 279.5538046471.

The spelling of 21847222 in words is "twenty-one million, eight hundred forty-seven thousand, two hundred twenty-two".