42216001 has 4 divisors (see below), whose sum is σ = 43357012.
Its totient is φ = 41074992.
The previous prime is 42215989. The next prime is 42216007. The reversal of 42216001 is 10061224.
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in 2 ways, for example, as 38452401 + 3763600 = 6201^2 + 1940^2
It is a cyclic number.
It is not a de Polignac number, because 42216001 - 25 = 42215969 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (42216007) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 570450 + ... + 570523.
It is an arithmetic number, because the mean of its divisors is an integer number (10839253).
Almost surely, 242216001 is an apocalyptic number.
It is an amenable number.
42216001 is a deficient number, since it is larger than the sum of its proper divisors (1141011).
42216001 is a wasteful number, since it uses less digits than its factorization.
42216001 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1141010.
The product of its (nonzero) digits is 96, while the sum is 16.
The square root of 42216001 is about 6497.3841659548.
The cubic root of 42216001 is about 348.1975389024.
Adding to 42216001 its reverse (10061224), we get a palindrome (52277225).
The spelling of 42216001 in words is "forty-two million, two hundred sixteen thousand, one".