131280021 has 48 divisors (see below), whose sum is σ = 208406016. Its totient is φ = 82413936.

The previous prime is 131280011. The next prime is 131280043. The reversal of 131280021 is 120082131.

It is not a de Polignac number, because 131280021 - 2⁶ = 131279957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131279976 and 131280003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131280011) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 463746 + ... + 464028.

It is an arithmetic number, because the mean of its divisors is an integer number (4341792).

Almost surely, 2^131280021 is an apocalyptic number.

It is an amenable number.

131280021 is a deficient number, since it is larger than the sum of its proper divisors (77125995).

131280021 is an equidigital number, since it uses as much as digits as its factorization.

131280021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404 (or 392 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 131280021 is about 11457.7493863324. The cubic root of 131280021 is about 508.2369224187.

The spelling of 131280021 in words is "one hundred thirty-one million, two hundred eighty thousand, twenty-one".