125252525221 has 2 divisors, whose sum is σ = 125252525222. Its totient is φ = 125252525220.

The previous prime is 125252525161. The next prime is 125252525273. The reversal of 125252525221 is 122525252521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96686793025 + 28565732196 = 310945^2 + 169014^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125252525221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125252525521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62626262610 + 62626262611.

It is an arithmetic number, because the mean of its divisors is an integer number (62626262611).

Almost surely, 2^125252525221 is an apocalyptic number.

It is an amenable number.

125252525221 is a deficient number, since it is larger than the sum of its proper divisors (1).

125252525221 is an equidigital number, since it uses as much as digits as its factorization.

125252525221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40000, while the sum is 34.

Adding to 125252525221 its reverse (122525252521), we get a palindrome (247777777742).

The spelling of 125252525221 in words is "one hundred twenty-five billion, two hundred fifty-two million, five hundred twenty-five thousand, two hundred twenty-one".