22000001 has 2 divisors, whose sum is σ = 22000002.
Its totient is φ = 22000000.
The previous prime is 21999977. The next prime is 22000003. The reversal of 22000001 is 10000022.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 14025025 + 7974976 = 3745^2 + 2824^2
It is a cyclic number.
It is not a de Polignac number, because 22000001 - 214 = 21983617 is a prime.
It is a Sophie Germain prime.
Together with 22000003, it forms a pair of twin primes.
It is a Chen prime.
It is a Curzon number.
It is not a weakly prime, because it can be changed into another prime (22000003) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11000000 + 11000001.
It is an arithmetic number, because the mean of its divisors is an integer number (11000001).
Almost surely, 222000001 is an apocalyptic number.
It is an amenable number.
22000001 is a deficient number, since it is larger than the sum of its proper divisors (1).
22000001 is an equidigital number, since it uses as much as digits as its factorization.
22000001 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 4, while the sum is 5.
The square root of 22000001 is about 4690.4158664238.
The cubic root of 22000001 is about 280.2039373111.
Adding to 22000001 its reverse (10000022), we get a palindrome (32000023).
Multiplying 22000001 by its reverse (10000022), we get a palindrome (220000494000022).
The spelling of 22000001 in words is "twenty-two million, one", and thus it is an aban number and an uban number.