125010670021 has 2 divisors, whose sum is σ = 125010670022. Its totient is φ = 125010670020.

The previous prime is 125010670019. The next prime is 125010670039. The reversal of 125010670021 is 120076010521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113713956225 + 11296713796 = 337215^2 + 106286^2 .

It is a cyclic number.

It is not a de Polignac number, because 125010670021 - 2¹ = 125010670019 is a prime.

Together with 125010670019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125010070021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62505335010 + 62505335011.

It is an arithmetic number, because the mean of its divisors is an integer number (62505335011).

Almost surely, 2^125010670021 is an apocalyptic number.

It is an amenable number.

125010670021 is a deficient number, since it is larger than the sum of its proper divisors (1).

125010670021 is an equidigital number, since it uses as much as digits as its factorization.

125010670021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 25.

Adding to 125010670021 its reverse (120076010521), we get a palindrome (245086680542).

The spelling of 125010670021 in words is "one hundred twenty-five billion, ten million, six hundred seventy thousand, twenty-one".