125140421 has 4 divisors (see below), whose sum is σ = 143017632. Its totient is φ = 107263212.

The previous prime is 125140409. The next prime is 125140429. The reversal of 125140421 is 124041521.

It is a happy number.

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 not a de Polignac number, because 125140421 - 2²² = 120946117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 125140393 and 125140402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125140429) 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, 8938595 + ... + 8938608.

It is an arithmetic number, because the mean of its divisors is an integer number (35754408).

Almost surely, 2^125140421 is an apocalyptic number.

It is an amenable number.

125140421 is a deficient number, since it is larger than the sum of its proper divisors (17877211).

125140421 is an equidigital number, since it uses as much as digits as its factorization.

125140421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17877210.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 125140421 is about 11186.6179428816. The cubic root of 125140421 is about 500.1871579351.

Adding to 125140421 its reverse (124041521), we get a palindrome (249181942).

The spelling of 125140421 in words is "one hundred twenty-five million, one hundred forty thousand, four hundred twenty-one".