21443222 has 24 divisors (see below), whose sum is σ = 35675856. Its totient is φ = 9646208.

The previous prime is 21443221. The next prime is 21443263. The reversal of 21443222 is 22234412.

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 21443194 and 21443203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21443221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12488 + ... + 14100.

It is an arithmetic number, because the mean of its divisors is an integer number (1486494).

Almost surely, 2^21443222 is an apocalyptic number.

21443222 is a deficient number, since it is larger than the sum of its proper divisors (14232634).

21443222 is a wasteful number, since it uses less digits than its factorization.

21443222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1672 (or 1655 counting only the distinct ones).

The product of its digits is 768, while the sum is 20.

The square root of 21443222 is about 4630.6826710540. The cubic root of 21443222 is about 277.8198978381.

Adding to 21443222 its reverse (22234412), we get a palindrome (43677634).

The spelling of 21443222 in words is "twenty-one million, four hundred forty-three thousand, two hundred twenty-two".