125020121 has 4 divisors (see below), whose sum is σ = 125063952. Its totient is φ = 124976292.

The previous prime is 125020109. The next prime is 125020127. The reversal of 125020121 is 121020521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125020121 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 = 125020096 and 125020105.

It is not an unprimeable number, because it can be changed into a prime (125020127) 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, 17315 + ... + 23448.

It is an arithmetic number, because the mean of its divisors is an integer number (31265988).

Almost surely, 2^125020121 is an apocalyptic number.

It is an amenable number.

125020121 is a deficient number, since it is larger than the sum of its proper divisors (43831).

125020121 is an equidigital number, since it uses as much as digits as its factorization.

125020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43830.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 125020121 is about 11181.2396897661. The cubic root of 125020121 is about 500.0268265606.

Adding to 125020121 its reverse (121020521), we get a palindrome (246040642).

The spelling of 125020121 in words is "one hundred twenty-five million, twenty thousand, one hundred twenty-one".