320421131 has 4 divisors (see below), whose sum is σ = 320458200. Its totient is φ = 320384064.

The previous prime is 320421107. The next prime is 320421133. The reversal of 320421131 is 131124023.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 131124023 = 149 ⋅880027.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320421131 is a prime.

It is a super-2 number, since 2×320421131² = 205339402382638322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320421133) 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, 2060 + ... + 25398.

It is an arithmetic number, because the mean of its divisors is an integer number (80114550).

Almost surely, 2^320421131 is an apocalyptic number.

320421131 is a deficient number, since it is larger than the sum of its proper divisors (37069).

320421131 is a wasteful number, since it uses less digits than its factorization.

320421131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37068.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 320421131 is about 17900.3109190874. The cubic root of 320421131 is about 684.2902987576.

Adding to 320421131 its reverse (131124023), we get a palindrome (451545154).

The spelling of 320421131 in words is "three hundred twenty million, four hundred twenty-one thousand, one hundred thirty-one".