4217921 has 8 divisors (see below), whose sum is σ = 4561920. Its totient is φ = 3884608.

The previous prime is 4217911. The next prime is 4217923. The reversal of 4217921 is 1297124.

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 4217921 - 2¹⁰ = 4216897 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4217923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1841 + ... + 3438.

It is an arithmetic number, because the mean of its divisors is an integer number (570240).

Almost surely, 2^4217921 is an apocalyptic number.

It is an amenable number.

4217921 is a deficient number, since it is larger than the sum of its proper divisors (343999).

4217921 is a wasteful number, since it uses less digits than its factorization.

4217921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5343.

The product of its digits is 1008, while the sum is 26.

The square root of 4217921 is about 2053.7577753961. The cubic root of 4217921 is about 161.5720171992.

The spelling of 4217921 in words is "four million, two hundred seventeen thousand, nine hundred twenty-one".