125035021 has 2 divisors, whose sum is σ = 125035022. Its totient is φ = 125035020.

The previous prime is 125034971. The next prime is 125035073. The reversal of 125035021 is 120530521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109432521 + 15602500 = 10461^2 + 3950^2 .

It is a cyclic number.

It is not a de Polignac number, because 125035021 - 2¹³ = 125026829 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 125035021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125035081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62517510 + 62517511.

It is an arithmetic number, because the mean of its divisors is an integer number (62517511).

Almost surely, 2^125035021 is an apocalyptic number.

It is an amenable number.

125035021 is a deficient number, since it is larger than the sum of its proper divisors (1).

125035021 is an equidigital number, since it uses as much as digits as its factorization.

125035021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 125035021 is about 11181.9059645483. The cubic root of 125035021 is about 500.0466903066.

Adding to 125035021 its reverse (120530521), we get a palindrome (245565542).

The spelling of 125035021 in words is "one hundred twenty-five million, thirty-five thousand, twenty-one".