131421 has 8 divisors (see below), whose sum is σ = 177984. Its totient is φ = 86240.

The previous prime is 131413. The next prime is 131431. The reversal of 131421 is 124131.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131421 - 2³ = 131413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131397 and 131406.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 131421.

It is not an unprimeable number, because it can be changed into a prime (131431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96 + ... + 521.

It is an arithmetic number, because the mean of its divisors is an integer number (22248).

2¹³¹⁴²¹ is an apocalyptic number.

It is an amenable number.

131421 is a deficient number, since it is larger than the sum of its proper divisors (46563).

131421 is an equidigital number, since it uses as much as digits as its factorization.

131421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691.

The product of its digits is 24, while the sum is 12.

The square root of 131421 is about 362.5203442567. The cubic root of 131421 is about 50.8418785837.

Adding to 131421 its reverse (124131), we get a palindrome (255552).

The spelling of 131421 in words is "one hundred thirty-one thousand, four hundred twenty-one".