125125021 has 8 divisors (see below), whose sum is σ = 147613184. Its totient is φ = 103790160.

The previous prime is 125125001. The next prime is 125125027. The reversal of 125125021 is 120521521.

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 125125021 - 2⁷ = 125124893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 125125021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125125027) 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, 288090 + ... + 288523.

It is an arithmetic number, because the mean of its divisors is an integer number (18451648).

Almost surely, 2^125125021 is an apocalyptic number.

It is an amenable number.

125125021 is a deficient number, since it is larger than the sum of its proper divisors (22488163).

125125021 is an equidigital number, since it uses as much as digits as its factorization.

125125021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576651.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 125125021 is about 11185.9295992778. The cubic root of 125125021 is about 500.1666391233.

Adding to 125125021 its reverse (120521521), we get a palindrome (245646542).

It can be divided in two parts, 12512502 and 1, that added together give a triangular number (12512503 = T₅₀₀₂).

The spelling of 125125021 in words is "one hundred twenty-five million, one hundred twenty-five thousand, twenty-one".