4242204121221 has 24 divisors (see below), whose sum is σ = 6684753366720. Its totient is φ = 2571006614400.

The previous prime is 4242204121069. The next prime is 4242204121247. The reversal of 4242204121221 is 1221214022424.

4242204121221 is a `hidden beast` number, since 4 + 2 + 4 + 2 + 20 + 412 + 1 + 221 = 666.

It is not a de Polignac number, because 4242204121221 - 2¹⁴ = 4242204104837 is a prime.

It is a super-2 number, since 2×4242204121221² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4242204121921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14623101 + ... + 14910381.

It is an arithmetic number, because the mean of its divisors is an integer number (278531390280).

Almost surely, 2^{4242204121221} is an apocalyptic number.

It is an amenable number.

4242204121221 is a deficient number, since it is larger than the sum of its proper divisors (2442549245499).

4242204121221 is a wasteful number, since it uses less digits than its factorization.

4242204121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436457 (or 436454 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 27.

Adding to 4242204121221 its reverse (1221214022424), we get a palindrome (5463418143645).

The spelling of 4242204121221 in words is "four trillion, two hundred forty-two billion, two hundred four million, one hundred twenty-one thousand, two hundred twenty-one".