131021200 has 30 divisors (see below), whose sum is σ = 314779394. Its totient is φ = 52408320.

The previous prime is 131021167. The next prime is 131021239. The reversal of 131021200 is 2120131.

It can be written as a sum of positive squares in 3 ways, for example, as 1607824 + 129413376 = 1268^2 + 11376^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 163377 + ... + 164176.

Almost surely, 2^131021200 is an apocalyptic number.

131021200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131021200 is an abundant number, since it is smaller than the sum of its proper divisors (183758194).

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

131021200 is a wasteful number, since it uses less digits than its factorization.

131021200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327571 (or 327560 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 131021200 is about 11446.4492310935. The cubic root of 131021200 is about 507.9027031715.

Adding to 131021200 its reverse (2120131), we get a palindrome (133141331).

The spelling of 131021200 in words is "one hundred thirty-one million, twenty-one thousand, two hundred".