4242821 has 8 divisors (see below), whose sum is σ = 4656288. Its totient is φ = 3834000.

The previous prime is 4242781. The next prime is 4242829. The reversal of 4242821 is 1282424.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4242821 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 (4242829) 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, 926 + ... + 3056.

It is an arithmetic number, because the mean of its divisors is an integer number (582036).

Almost surely, 2^4242821 is an apocalyptic number.

It is an amenable number.

4242821 is a deficient number, since it is larger than the sum of its proper divisors (413467).

4242821 is a wasteful number, since it uses less digits than its factorization.

4242821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2323.

The product of its digits is 1024, while the sum is 23.

The square root of 4242821 is about 2059.8109136520. The cubic root of 4242821 is about 161.8893340616.

The spelling of 4242821 in words is "four million, two hundred forty-two thousand, eight hundred twenty-one".