21202222 has 8 divisors (see below), whose sum is σ = 32006376. Its totient is φ = 10533432.

The previous prime is 21202211. The next prime is 21202261. The reversal of 21202222 is 22220212.

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

21202222 is a modest number, since divided by 2222 gives 2120 as remainder.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 33448 + ... + 34075.

It is an arithmetic number, because the mean of its divisors is an integer number (4000797).

Almost surely, 2^21202222 is an apocalyptic number.

21202222 is a deficient number, since it is larger than the sum of its proper divisors (10804154).

21202222 is a wasteful number, since it uses less digits than its factorization.

21202222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67682.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 21202222 is about 4604.5870607471. The cubic root of 21202222 is about 276.7751697770.

Adding to 21202222 its reverse (22220212), we get a palindrome (43422434).

The spelling of 21202222 in words is "twenty-one million, two hundred two thousand, two hundred twenty-two".