22200012 has 36 divisors (see below), whose sum is σ = 56443296.
Its totient is φ = 7356960.
The previous prime is 22200001. The next prime is 22200023. The reversal of 22200012 is 21000222.
It is an interprime number because it is at equal distance from previous prime (22200001) and next prime (22200023).
It is a tau number, because it is divible by the number of its divisors (36).
It is a Harshad number since it is a multiple of its sum of digits (9).
It is a junction number, because it is equal to n+sod(n) for n = 22199967 and 22200003.
It is an unprimeable number.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4813 + ... + 8219.
Almost surely, 222200012 is an apocalyptic number.
It is an amenable number.
22200012 is an abundant number, since it is smaller than the sum of its proper divisors (34243284).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
22200012 is a wasteful number, since it uses less digits than its factorization.
22200012 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 3598 (or 3593 counting only the distinct ones).
The product of its (nonzero) digits is 16, while the sum is 9.
The square root of 22200012 is about 4711.6888691848.
The cubic root of 22200012 is about 281.0505264108.
Adding to 22200012 its reverse (21000222), we get a palindrome (43200234).
The spelling of 22200012 in words is "twenty-two million, two hundred thousand, twelve".