21102222 has 8 divisors (see below), whose sum is σ = 42204456. Its totient is φ = 7034072.

The previous prime is 21102209. The next prime is 21102239. The reversal of 21102222 is 22220112.

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

21102222 is an admirable number.

21102222 is a modest number, since divided by 2222 gives 2110 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 21102198 and 21102207.

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, 1758513 + ... + 1758524.

It is an arithmetic number, because the mean of its divisors is an integer number (5275557).

Almost surely, 2^21102222 is an apocalyptic number.

21102222 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21102222 is a wasteful number, since it uses less digits than its factorization.

21102222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3517042.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 21102222 is about 4593.7154896663. The cubic root of 21102222 is about 276.3393483978.

Adding to 21102222 its reverse (22220112), we get a palindrome (43322334).

The spelling of 21102222 in words is "twenty-one million, one hundred two thousand, two hundred twenty-two".