125135421 has 8 divisors (see below), whose sum is σ = 168467520. Its totient is φ = 82613472.

The previous prime is 125135407. The next prime is 125135429. The reversal of 125135421 is 124531521.

It is a happy number.

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

It is not a de Polignac number, because 125135421 - 2⁶ = 125135357 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 125135391 and 125135400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125135429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202176 + ... + 202793.

It is an arithmetic number, because the mean of its divisors is an integer number (21058440).

Almost surely, 2^125135421 is an apocalyptic number.

It is an amenable number.

125135421 is a deficient number, since it is larger than the sum of its proper divisors (43332099).

125135421 is a wasteful number, since it uses less digits than its factorization.

125135421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405075.

The product of its digits is 1200, while the sum is 24.

The square root of 125135421 is about 11186.3944593421. The cubic root of 125135421 is about 500.1804961678.

Adding to 125135421 its reverse (124531521), we get a palindrome (249666942).

The spelling of 125135421 in words is "one hundred twenty-five million, one hundred thirty-five thousand, four hundred twenty-one".