4021220444444 has 36 divisors (see below), whose sum is σ = 8186264029944. Its totient is φ = 1723336374816.

The previous prime is 4021220444389. The next prime is 4021220444471. The reversal of 4021220444444 is 4444440221204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8159807 + ... + 8638569.

It is an arithmetic number, because the mean of its divisors is an integer number (227396223054).

Almost surely, 2^{4021220444444} is an apocalyptic number.

It is an amenable number.

4021220444444 is an abundant number, since it is smaller than the sum of its proper divisors (4165043585500).

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

4021220444444 is a wasteful number, since it uses less digits than its factorization.

4021220444444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521634 (or 521625 counting only the distinct ones).

The product of its (nonzero) digits is 131072, while the sum is 35.

Adding to 4021220444444 its reverse (4444440221204), we get a palindrome (8465660665648).

The spelling of 4021220444444 in words is "four trillion, twenty-one billion, two hundred twenty million, four hundred forty-four thousand, four hundred forty-four".