4243020211221 has 32 divisors (see below), whose sum is σ = 6181126848000. Its totient is φ = 2567587982400.

The previous prime is 4243020211189. The next prime is 4243020211231. The reversal of 4243020211221 is 1221120203424.

It is not a de Polignac number, because 4243020211221 - 2⁵ = 4243020211189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4243020211191 and 4243020211200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4243020211231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65752030 + ... + 65816528.

It is an arithmetic number, because the mean of its divisors is an integer number (193160214000).

Almost surely, 2^{4243020211221} is an apocalyptic number.

It is an amenable number.

4243020211221 is a deficient number, since it is larger than the sum of its proper divisors (1938106636779).

4243020211221 is a wasteful number, since it uses less digits than its factorization.

4243020211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67537.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 4243020211221 its reverse (1221120203424), we get a palindrome (5464140414645).

The spelling of 4243020211221 in words is "four trillion, two hundred forty-three billion, twenty million, two hundred eleven thousand, two hundred twenty-one".