22211812 has 12 divisors (see below), whose sum is σ = 44423680. Its totient is φ = 9519336.

The previous prime is 22211807. The next prime is 22211851. The reversal of 22211812 is 21811222.

22211812 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 22211812.

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, 396612 + ... + 396667.

Almost surely, 2^22211812 is an apocalyptic number.

It is an amenable number.

22211812 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.

22211812 is a wasteful number, since it uses less digits than its factorization.

22211812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793290 (or 793288 counting only the distinct ones).

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

The square root of 22211812 is about 4712.9409077560. The cubic root of 22211812 is about 281.1003133027.

The spelling of 22211812 in words is "twenty-two million, two hundred eleven thousand, eight hundred twelve".