4021321144 has 16 divisors (see below), whose sum is σ = 7544232720. Its totient is φ = 2009525760.

The previous prime is 4021321141. The next prime is 4021321189. The reversal of 4021321144 is 4411231204.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021321141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126697 + ... + 155224.

It is an arithmetic number, because the mean of its divisors is an integer number (471514545).

Almost surely, 2^4021321144 is an apocalyptic number.

It is an amenable number.

4021321144 is a deficient number, since it is larger than the sum of its proper divisors (3522911576).

4021321144 is a wasteful number, since it uses less digits than its factorization.

4021321144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283710 (or 283706 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 4021321144 is about 63413.8876272382. The cubic root of 4021321144 is about 1590.2164893835.

Adding to 4021321144 its reverse (4411231204), we get a palindrome (8432552348).

The spelling of 4021321144 in words is "four billion, twenty-one million, three hundred twenty-one thousand, one hundred forty-four".