125421123 has 4 divisors (see below), whose sum is σ = 167228168. Its totient is φ = 83614080.

The previous prime is 125421059. The next prime is 125421137. The reversal of 125421123 is 321124521.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 125421123 - 2⁶ = 125421059 is a prime.

It is a super-2 number, since 2×125421123² = 31460916189162258, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 125421123.

It is not an unprimeable number, because it can be changed into a prime (125421193) 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, 20903518 + ... + 20903523.

It is an arithmetic number, because the mean of its divisors is an integer number (41807042).

Almost surely, 2^125421123 is an apocalyptic number.

125421123 is a deficient number, since it is larger than the sum of its proper divisors (41807045).

125421123 is an equidigital number, since it uses as much as digits as its factorization.

125421123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41807044.

The product of its digits is 480, while the sum is 21.

The square root of 125421123 is about 11199.1572450788. The cubic root of 125421123 is about 500.5608679524.

Adding to 125421123 its reverse (321124521), we get a palindrome (446545644).

The spelling of 125421123 in words is "one hundred twenty-five million, four hundred twenty-one thousand, one hundred twenty-three".