18821222 has 16 divisors (see below), whose sum is σ = 33668352. Its totient is φ = 7715400.

The previous prime is 18821219. The next prime is 18821239. The reversal of 18821222 is 22212881.

It is a junction number, because it is equal to n+sod(n) for n = 18821191 and 18821200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28904 + ... + 29547.

It is an arithmetic number, because the mean of its divisors is an integer number (2104272).

Almost surely, 2^18821222 is an apocalyptic number.

18821222 is a deficient number, since it is larger than the sum of its proper divisors (14847130).

18821222 is a wasteful number, since it uses less digits than its factorization.

18821222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58483.

The product of its digits is 1024, while the sum is 26.

The square root of 18821222 is about 4338.3432321567. The cubic root of 18821222 is about 266.0005935879. Note that the first 3 decimals are identical.

The spelling of 18821222 in words is "eighteen million, eight hundred twenty-one thousand, two hundred twenty-two".