125503115421 has 4 divisors (see below), whose sum is σ = 167337487232. Its totient is φ = 83668743612.

The previous prime is 125503115401. The next prime is 125503115453. The reversal of 125503115421 is 124511305521.

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, and also an emirpimes, since its reverse is a distinct semiprime: 124511305521 = 3 ⋅41503768507.

It is not a de Polignac number, because 125503115421 - 2²³ = 125494726813 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125503115401) 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 3 ways as a sum of consecutive naturals, for example, 20917185901 + ... + 20917185906.

It is an arithmetic number, because the mean of its divisors is an integer number (41834371808).

Almost surely, 2^125503115421 is an apocalyptic number.

It is an amenable number.

125503115421 is a deficient number, since it is larger than the sum of its proper divisors (41834371811).

125503115421 is an equidigital number, since it uses as much as digits as its factorization.

125503115421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41834371810.

The product of its (nonzero) digits is 6000, while the sum is 30.

The spelling of 125503115421 in words is "one hundred twenty-five billion, five hundred three million, one hundred fifteen thousand, four hundred twenty-one".