22002012 has 36 divisors (see below), whose sum is σ = 58889376.
Its totient is φ = 6902400.
The previous prime is 22002011. The next prime is 22002023. The reversal of 22002012 is 21020022.
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 = 22001985 and 22002003.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (22002011) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17364 + ... + 18587.
It is an arithmetic number, because the mean of its divisors is an integer number (1635816).
Almost surely, 222002012 is an apocalyptic number.
It is an amenable number.
22002012 is an abundant number, since it is smaller than the sum of its proper divisors (36887364).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
22002012 is a wasteful number, since it uses less digits than its factorization.
22002012 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 35978 (or 35973 counting only the distinct ones).
The product of its (nonzero) digits is 16, while the sum is 9.
The square root of 22002012 is about 4690.6302348405.
The cubic root of 22002012 is about 280.2124747796.
Adding to 22002012 its reverse (21020022), we get a palindrome (43022034).
The spelling of 22002012 in words is "twenty-two million, two thousand, twelve".