4217421 has 8 divisors (see below), whose sum is σ = 6055840. Its totient is φ = 2595312.

The previous prime is 4217417. The next prime is 4217431. The reversal of 4217421 is 1247124.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4217421 - 2² = 4217417 is a prime.

It is a Duffinian number.

It is a Curzon number.

4217421 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4217401) 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, 54031 + ... + 54108.

It is an arithmetic number, because the mean of its divisors is an integer number (756980).

Almost surely, 2^4217421 is an apocalyptic number.

It is an amenable number.

4217421 is a deficient number, since it is larger than the sum of its proper divisors (1838419).

4217421 is a wasteful number, since it uses less digits than its factorization.

4217421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108155.

The product of its digits is 448, while the sum is 21.

The square root of 4217421 is about 2053.6360437039. The cubic root of 4217421 is about 161.5656326003.

It can be divided in two parts, 42174 and 21, that added together give a triangular number (42195 = T₂₉₀).

The spelling of 4217421 in words is "four million, two hundred seventeen thousand, four hundred twenty-one".