125443123021 has 4 divisors (see below), whose sum is σ = 130897171872. Its totient is φ = 119989074172.

The previous prime is 125443122997. The next prime is 125443123031. The reversal of 125443123021 is 120321344521.

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-125443123021 is a prime.

It is a super-2 number, since 2×125443123021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125443123031) 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, 2727024391 + ... + 2727024436.

It is an arithmetic number, because the mean of its divisors is an integer number (32724292968).

Almost surely, 2^125443123021 is an apocalyptic number.

It is an amenable number.

125443123021 is a deficient number, since it is larger than the sum of its proper divisors (5454048851).

125443123021 is an equidigital number, since it uses as much as digits as its factorization.

125443123021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5454048850.

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 125443123021 its reverse (120321344521), we get a palindrome (245764467542).

The spelling of 125443123021 in words is "one hundred twenty-five billion, four hundred forty-three million, one hundred twenty-three thousand, twenty-one".