125421 has 8 divisors (see below), whose sum is σ = 169344. Its totient is φ = 82560.

The previous prime is 125407. The next prime is 125423. The reversal of 125421 is 124521.

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

It is not a de Polignac number, because 125421 - 2⁹ = 124909 is a prime.

125421 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 125421.

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 125421.

It is not an unprimeable number, because it can be changed into a prime (125423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76 + ... + 506.

It is an arithmetic number, because the mean of its divisors is an integer number (21168).

2¹²⁵⁴²¹ is an apocalyptic number.

It is an amenable number.

125421 is a deficient number, since it is larger than the sum of its proper divisors (43923).

125421 is an equidigital number, since it uses as much as digits as its factorization.

125421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531.

The product of its digits is 80, while the sum is 15.

The square root of 125421 is about 354.1482740322. The cubic root of 125421 is about 50.0560704320.

Adding to 125421 its reverse (124521), we get a palindrome (249942).

Subtracting from 125421 its reverse (124521), we obtain a square (900 = 30²).

It can be divided in two parts, 1254 and 21, that added together give a triangular number (1275 = T₅₀).

The spelling of 125421 in words is "one hundred twenty-five thousand, four hundred twenty-one".