22002001 has 8 divisors (see below), whose sum is σ = 25173824.
Its totient is φ = 18837360.
The previous prime is 22001999. The next prime is 22002011. The reversal of 22002001 is 10020022.
Adding to 22002001 its reverse (10020022), we get a palindrome (32022023).
It is a happy number.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 22002001 - 21 = 22001999 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (7).
It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 9691 + ... + 11743.
It is an arithmetic number, because the mean of its divisors is an integer number (3146728).
Almost surely, 222002001 is an apocalyptic number.
It is an amenable number.
22002001 is a deficient number, since it is larger than the sum of its proper divisors (3171823).
22002001 is a wasteful number, since it uses less digits than its factorization.
22002001 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 3591.
The product of its (nonzero) digits is 8, while the sum is 7.
The square root of 22002001 is about 4690.6290622900.
The cubic root of 22002001 is about 280.2124280818.
The spelling of 22002001 in words is "twenty-two million, two thousand, one".