2421221 has 8 divisors (see below), whose sum is σ = 2668224. Its totient is φ = 2178720.

The previous prime is 2421203. The next prime is 2421229. The reversal of 2421221 is 1221242.

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-2421221 is a prime.

It is a super-2 number, since 2×2421221² = 11724622261682, 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 = 2421196 and 2421205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2421229) 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, 65 + ... + 2201.

It is an arithmetic number, because the mean of its divisors is an integer number (333528).

2^2421221 is an apocalyptic number.

It is an amenable number.

2421221 is a deficient number, since it is larger than the sum of its proper divisors (247003).

2421221 is a wasteful number, since it uses less digits than its factorization.

2421221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2251.

The product of its digits is 64, while the sum is 14.

The square root of 2421221 is about 1556.0273133850. The cubic root of 2421221 is about 134.2800447605.

Adding to 2421221 its reverse (1221242), we get a palindrome (3642463).

The spelling of 2421221 in words is "two million, four hundred twenty-one thousand, two hundred twenty-one".