4021217 has 4 divisors (see below), whose sum is σ = 4232880.
Its totient is φ = 3809556.
The previous prime is 4021211. The next prime is 4021229. The reversal of 4021217 is 7121204.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.
It is a cyclic number.
It is not a de Polignac number, because 4021217 - 26 = 4021153 is a prime.
It is a super-2 number, since 2×40212172 = 32340372322178, which contains 22 as substring.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 4021195 and 4021204.
It is not an unprimeable number, because it can be changed into a prime (4021211) 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, 105803 + ... + 105840.
It is an arithmetic number, because the mean of its divisors is an integer number (1058220).
Almost surely, 24021217 is an apocalyptic number.
It is an amenable number.
4021217 is a deficient number, since it is larger than the sum of its proper divisors (211663).
4021217 is a wasteful number, since it uses less digits than its factorization.
4021217 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 211662.
The product of its (nonzero) digits is 112, while the sum is 17.
The square root of 4021217 is about 2005.2972348258.
The cubic root of 4021217 is about 159.0202761479.
The spelling of 4021217 in words is "four million, twenty-one thousand, two hundred seventeen".