131104021 has 4 divisors (see below), whose sum is σ = 131147532. Its totient is φ = 131060512.

The previous prime is 131104007. The next prime is 131104027. The reversal of 131104021 is 120401131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 112656996 + 18447025 = 10614^2 + 4295^2 .

It is a cyclic number.

It is not a de Polignac number, because 131104021 - 2⁹ = 131103509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131103992 and 131104010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131104027) 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, 16870 + ... + 23383.

It is an arithmetic number, because the mean of its divisors is an integer number (32786883).

Almost surely, 2^131104021 is an apocalyptic number.

It is an amenable number.

131104021 is a deficient number, since it is larger than the sum of its proper divisors (43511).

131104021 is an equidigital number, since it uses as much as digits as its factorization.

131104021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43510.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 131104021 is about 11450.0664190213. The cubic root of 131104021 is about 508.0096989592.

Adding to 131104021 its reverse (120401131), we get a palindrome (251505152).

The spelling of 131104021 in words is "one hundred thirty-one million, one hundred four thousand, twenty-one".