320143142040021 has 12 divisors (see below), whose sum is σ = 474927063567372. Its totient is φ = 207660416458176.

The previous prime is 320143142039863. The next prime is 320143142040023. The reversal of 320143142040021 is 120040241341023.

320143142040021 is a `hidden beast` number, since 3 + 2 + 0 + 1 + 431 + 4 + 204 + 0 + 0 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 128646975330225 + 191496166709796 = 11342265^2 + 13838214^2 .

It is not a de Polignac number, because 320143142040021 - 2¹⁷ = 320143141908949 is a prime.

It is a super-2 number, since 2×320143142040021² (a number of 30 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320143142040023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 480695408136 + ... + 480695408801.

It is an arithmetic number, because the mean of its divisors is an integer number (39577255297281).

Almost surely, 2^{320143142040021} is an apocalyptic number.

It is an amenable number.

320143142040021 is a deficient number, since it is larger than the sum of its proper divisors (154783921527351).

320143142040021 is a wasteful number, since it uses less digits than its factorization.

320143142040021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961390816980 (or 961390816977 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 320143142040021 its reverse (120040241341023), we get a palindrome (440183383381044).

The spelling of 320143142040021 in words is "three hundred twenty trillion, one hundred forty-three billion, one hundred forty-two million, forty thousand, twenty-one".