4021221004021 has 16 divisors (see below), whose sum is σ = 4519216791936. Its totient is φ = 3550205837376.

The previous prime is 4021221003941. The next prime is 4021221004027. The reversal of 4021221004021 is 1204001221204.

4021221004021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 4021221004021 - 2¹⁵ = 4021220971253 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 4021221004021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021221004027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2962846 + ... + 4101328.

It is an arithmetic number, because the mean of its divisors is an integer number (282451049496).

Almost surely, 2^{4021221004021} is an apocalyptic number.

It is an amenable number.

4021221004021 is a deficient number, since it is larger than the sum of its proper divisors (497995787915).

4021221004021 is a wasteful number, since it uses less digits than its factorization.

4021221004021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1150332.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 4021221004021 its reverse (1204001221204), we get a palindrome (5225222225225).

The spelling of 4021221004021 in words is "four trillion, twenty-one billion, two hundred twenty-one million, four thousand, twenty-one".