2421243203221 has 4 divisors (see below), whose sum is σ = 2421250833600. Its totient is φ = 2421235572844.

The previous prime is 2421243203213. The next prime is 2421243203263. The reversal of 2421243203221 is 1223023421242.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2421243203221 - 2³ = 2421243203213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2421243203221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2421243203201) 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, 3317581 + ... + 3981058.

It is an arithmetic number, because the mean of its divisors is an integer number (605312708400).

Almost surely, 2^{2421243203221} is an apocalyptic number.

It is an amenable number.

2421243203221 is a deficient number, since it is larger than the sum of its proper divisors (7630379).

2421243203221 is an equidigital number, since it uses as much as digits as its factorization.

2421243203221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7630378.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 2421243203221 its reverse (1223023421242), we get a palindrome (3644266624463).

The spelling of 2421243203221 in words is "two trillion, four hundred twenty-one billion, two hundred forty-three million, two hundred three thousand, two hundred twenty-one".