4021320144 has 20 divisors (see below), whose sum is σ = 10388410496. Its totient is φ = 1340440032.

The previous prime is 4021320103. The next prime is 4021320167. The reversal of 4021320144 is 4410231204.

It is a self number, because there is not a number n which added to its sum of digits gives 4021320144.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41888704 + ... + 41888799.

Almost surely, 2^4021320144 is an apocalyptic number.

It is an amenable number.

4021320144 is an abundant number, since it is smaller than the sum of its proper divisors (6367090352).

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

4021320144 is a wasteful number, since it uses less digits than its factorization.

4021320144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83777514 (or 83777508 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 4021320144 is about 63413.8797425296. The cubic root of 4021320144 is about 1590.2163575680.

Adding to 4021320144 its reverse (4410231204), we get a palindrome (8431551348).

The spelling of 4021320144 in words is "four billion, twenty-one million, three hundred twenty thousand, one hundred forty-four".