21222118 has 8 divisors (see below), whose sum is σ = 31864248. Its totient is φ = 10600704.

The previous prime is 21222043. The next prime is 21222143. The reversal of 21222118 is 81122212.

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

It is a junction number, because it is equal to n+sod(n) for n = 21222095 and 21222104.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2296 + ... + 6907.

It is an arithmetic number, because the mean of its divisors is an integer number (3983031).

Almost surely, 2^21222118 is an apocalyptic number.

21222118 is a deficient number, since it is larger than the sum of its proper divisors (10642130).

21222118 is a wasteful number, since it uses less digits than its factorization.

21222118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10358.

The product of its digits is 128, while the sum is 19.

The square root of 21222118 is about 4606.7470084649. The cubic root of 21222118 is about 276.8617172654.

The spelling of 21222118 in words is "twenty-one million, two hundred twenty-two thousand, one hundred eighteen".