4021172321 has 4 divisors (see below), whose sum is σ = 4129852692. Its totient is φ = 3912491952.

The previous prime is 4021172291. The next prime is 4021172329. The reversal of 4021172321 is 1232711204.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2793651025 + 1227521296 = 52855^2 + 35036^2 .

It is a cyclic number.

It is not a de Polignac number, because 4021172321 - 2⁶ = 4021172257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4021172329) 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, 54340130 + ... + 54340203.

It is an arithmetic number, because the mean of its divisors is an integer number (1032463173).

Almost surely, 2^4021172321 is an apocalyptic number.

It is an amenable number.

4021172321 is a deficient number, since it is larger than the sum of its proper divisors (108680371).

4021172321 is a wasteful number, since it uses less digits than its factorization.

4021172321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108680370.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 4021172321 is about 63412.7141904524. The cubic root of 4021172321 is about 1590.1968719742.

Adding to 4021172321 its reverse (1232711204), we get a palindrome (5253883525).

The spelling of 4021172321 in words is "four billion, twenty-one million, one hundred seventy-two thousand, three hundred twenty-one".