125454345421 has 4 divisors (see below), whose sum is σ = 127172898172. Its totient is φ = 123735792672.

The previous prime is 125454345397. The next prime is 125454345427. The reversal of 125454345421 is 124543454521.

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

It can be written as a sum of positive squares in 2 ways, for example, as 39915644521 + 85538700900 = 199789^2 + 292470^2 .

It is a cyclic number.

It is not a de Polignac number, because 125454345421 - 2⁵ = 125454345389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125454345427) 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, 859276266 + ... + 859276411.

It is an arithmetic number, because the mean of its divisors is an integer number (31793224543).

Almost surely, 2^125454345421 is an apocalyptic number.

It is an amenable number.

125454345421 is a deficient number, since it is larger than the sum of its proper divisors (1718552751).

125454345421 is an equidigital number, since it uses as much as digits as its factorization.

125454345421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1718552750.

The product of its digits is 384000, while the sum is 40.

Adding to 125454345421 its reverse (124543454521), we get a palindrome (249997799942).

The spelling of 125454345421 in words is "one hundred twenty-five billion, four hundred fifty-four million, three hundred forty-five thousand, four hundred twenty-one".