4021221004220 has 144 divisors (see below), whose sum is σ = 10058659779168. Its totient is φ = 1345711288320.

The previous prime is 4021221004109. The next prime is 4021221004327. The reversal of 4021221004220 is 224001221204.

4021221004220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 4021221004192 and 4021221004201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 62377124 + ... + 62441556.

It is an arithmetic number, because the mean of its divisors is an integer number (69851804022).

Almost surely, 2^{4021221004220} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4021221004220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5029329889584).

4021221004220 is an abundant number, since it is smaller than the sum of its proper divisors (6037438774948).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4021221004220 is a wasteful number, since it uses less digits than its factorization.

4021221004220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65980 (or 65971 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 4021221004220 its reverse (224001221204), we get a palindrome (4245222225424).

The spelling of 4021221004220 in words is "four trillion, twenty-one billion, two hundred twenty-one million, four thousand, two hundred twenty".