125021 has 8 divisors (see below), whose sum is σ = 137760. Its totient is φ = 112752.

The previous prime is 125017. The next prime is 125029. The reversal of 125021 is 120521.

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 125021 - 2² = 125017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 124993 and 125011.

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 125021.

It is not an unprimeable number, because it can be changed into a prime (125029) 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, 686 + ... + 848.

It is an arithmetic number, because the mean of its divisors is an integer number (17220).

125021 is a Friedman number, since it can be written as 50^(2+1)+21, using all its digits and the basic arithmetic operations.

2¹²⁵⁰²¹ is an apocalyptic number.

It is an amenable number.

125021 is a deficient number, since it is larger than the sum of its proper divisors (12739).

125021 is a wasteful number, since it uses less digits than its factorization.

125021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235.

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 125021 is about 353.5830878309. The cubic root of 125021 is about 50.0027998432.

Adding to 125021 its reverse (120521), we get a palindrome (245542).

The spelling of 125021 in words is "one hundred twenty-five thousand, twenty-one".