131300021 has 4 divisors (see below), whose sum is σ = 132527232. Its totient is φ = 130072812.

The previous prime is 131299997. The next prime is 131300047. The reversal of 131300021 is 120003131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 131300021 - 2¹⁰ = 131298997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131299975 and 131300011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131330021) 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, 613445 + ... + 613658.

It is an arithmetic number, because the mean of its divisors is an integer number (33131808).

Almost surely, 2^131300021 is an apocalyptic number.

It is an amenable number.

131300021 is a deficient number, since it is larger than the sum of its proper divisors (1227211).

131300021 is a wasteful number, since it uses less digits than its factorization.

131300021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1227210.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 131300021 is about 11458.6221248456. The cubic root of 131300021 is about 508.2627304135.

Adding to 131300021 its reverse (120003131), we get a palindrome (251303152).

The spelling of 131300021 in words is "one hundred thirty-one million, three hundred thousand, twenty-one".