125045021 has 2 divisors, whose sum is σ = 125045022. Its totient is φ = 125045020.

The previous prime is 125044991. The next prime is 125045027. The reversal of 125045021 is 120540521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109725625 + 15319396 = 10475^2 + 3914^2 .

It is a cyclic number.

It is not a de Polignac number, because 125045021 - 2¹⁴ = 125028637 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 125044984 and 125045002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125045027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62522510 + 62522511.

It is an arithmetic number, because the mean of its divisors is an integer number (62522511).

Almost surely, 2^125045021 is an apocalyptic number.

It is an amenable number.

125045021 is a deficient number, since it is larger than the sum of its proper divisors (1).

125045021 is an equidigital number, since it uses as much as digits as its factorization.

125045021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 125045021 is about 11182.3531065693. The cubic root of 125045021 is about 500.0600207947.

Adding to 125045021 its reverse (120540521), we get a palindrome (245585542).

The spelling of 125045021 in words is "one hundred twenty-five million, forty-five thousand, twenty-one".