125138421 has 12 divisors (see below), whose sum is σ = 181071072. Its totient is φ = 83279976.

The previous prime is 125138401. The next prime is 125138443. The reversal of 125138421 is 124831521.

It is not a de Polignac number, because 125138421 - 2²⁶ = 58029557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125138401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6561 + ... + 17126.

It is an arithmetic number, because the mean of its divisors is an integer number (15089256).

Almost surely, 2^125138421 is an apocalyptic number.

It is an amenable number.

125138421 is a deficient number, since it is larger than the sum of its proper divisors (55932651).

125138421 is a wasteful number, since it uses less digits than its factorization.

125138421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24280 (or 24277 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 125138421 is about 11186.5285500016. The cubic root of 125138421 is about 500.1844932494.

Adding to 125138421 its reverse (124831521), we get a palindrome (249969942).

The spelling of 125138421 in words is "one hundred twenty-five million, one hundred thirty-eight thousand, four hundred twenty-one".