4216621 has 4 divisors (see below), whose sum is σ = 4222044. Its totient is φ = 4211200.

The previous prime is 4216607. The next prime is 4216633. The reversal of 4216621 is 1266124.

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 2975625 + 1240996 = 1725^2 + 1114^2 .

It is a cyclic number.

It is not a de Polignac number, because 4216621 - 2¹³ = 4208429 is a prime.

It is a Duffinian number.

4216621 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 4216592 and 4216601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4216661) 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, 1300 + ... + 3181.

It is an arithmetic number, because the mean of its divisors is an integer number (1055511).

Almost surely, 2^4216621 is an apocalyptic number.

It is an amenable number.

4216621 is a deficient number, since it is larger than the sum of its proper divisors (5423).

4216621 is an equidigital number, since it uses as much as digits as its factorization.

4216621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5422.

The product of its digits is 576, while the sum is 22.

The square root of 4216621 is about 2053.4412579862. The cubic root of 4216621 is about 161.5554161924. Note that the first 3 decimals are identical.

The spelling of 4216621 in words is "four million, two hundred sixteen thousand, six hundred twenty-one".