21109222 has 4 divisors (see below), whose sum is σ = 31663836. Its totient is φ = 10554610.

The previous prime is 21109217. The next prime is 21109229. The reversal of 21109222 is 22290112.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21109222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21109229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5277304 + ... + 5277307.

It is an arithmetic number, because the mean of its divisors is an integer number (7915959).

Almost surely, 2^21109222 is an apocalyptic number.

21109222 is a deficient number, since it is larger than the sum of its proper divisors (10554614).

21109222 is a wasteful number, since it uses less digits than its factorization.

21109222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10554613.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 21109222 is about 4594.4773369775. The cubic root of 21109222 is about 276.3699006557.

Adding to 21109222 its reverse (22290112), we get a palindrome (43399334).

The spelling of 21109222 in words is "twenty-one million, one hundred nine thousand, two hundred twenty-two".