21200222 has 8 divisors (see below), whose sum is σ = 32236176. Its totient is φ = 10454832.

The previous prime is 21200209. The next prime is 21200233. The reversal of 21200222 is 22200212.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72458 + ... + 72749.

It is an arithmetic number, because the mean of its divisors is an integer number (4029522).

Almost surely, 2^21200222 is an apocalyptic number.

21200222 is a deficient number, since it is larger than the sum of its proper divisors (11035954).

21200222 is a wasteful number, since it uses less digits than its factorization.

21200222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145282.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 21200222 is about 4604.3698808849. The cubic root of 21200222 is about 276.7664667938.

Adding to 21200222 its reverse (22200212), we get a palindrome (43400434).

The spelling of 21200222 in words is "twenty-one million, two hundred thousand, two hundred twenty-two".