131021320 has 32 divisors (see below), whose sum is σ = 296962200. Its totient is φ = 52023808.

The previous prime is 131021311. The next prime is 131021323. The reversal of 131021320 is 23120131.

It can be written as a sum of positive squares in 4 ways, for example, as 78110244 + 52911076 = 8838^2 + 7274^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 131021320.

It is not an unprimeable number, because it can be changed into a prime (131021323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6475 + ... + 17434.

Almost surely, 2^131021320 is an apocalyptic number.

131021320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131021320 is an abundant number, since it is smaller than the sum of its proper divisors (165940880).

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

131021320 is a wasteful number, since it uses less digits than its factorization.

131021320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24057 (or 24053 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 131021320 is about 11446.4544728925. The cubic root of 131021320 is about 507.9028582311.

Adding to 131021320 its reverse (23120131), we get a palindrome (154141451).

The spelling of 131021320 in words is "one hundred thirty-one million, twenty-one thousand, three hundred twenty".