125056421 has 4 divisors (see below), whose sum is σ = 142921632. Its totient is φ = 107191212.

The previous prime is 125056367. The next prime is 125056429. The reversal of 125056421 is 124650521.

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-125056421 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125056429) 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, 8932595 + ... + 8932608.

It is an arithmetic number, because the mean of its divisors is an integer number (35730408).

Almost surely, 2^125056421 is an apocalyptic number.

It is an amenable number.

125056421 is a deficient number, since it is larger than the sum of its proper divisors (17865211).

125056421 is an equidigital number, since it uses as much as digits as its factorization.

125056421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17865210.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 125056421 is about 11182.8628266647. The cubic root of 125056421 is about 500.0752166843.

The spelling of 125056421 in words is "one hundred twenty-five million, fifty-six thousand, four hundred twenty-one".