125429021 has 2 divisors, whose sum is σ = 125429022. Its totient is φ = 125429020.

The previous prime is 125428991. The next prime is 125429023. The reversal of 125429021 is 120924521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94848121 + 30580900 = 9739^2 + 5530^2 .

It is a cyclic number.

It is not a de Polignac number, because 125429021 - 2¹⁰ = 125427997 is a prime.

Together with 125429023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125429023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62714510 + 62714511.

It is an arithmetic number, because the mean of its divisors is an integer number (62714511).

Almost surely, 2^125429021 is an apocalyptic number.

It is an amenable number.

125429021 is a deficient number, since it is larger than the sum of its proper divisors (1).

125429021 is an equidigital number, since it uses as much as digits as its factorization.

125429021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 125429021 is about 11199.5098553463. The cubic root of 125429021 is about 500.5713748129.

The spelling of 125429021 in words is "one hundred twenty-five million, four hundred twenty-nine thousand, twenty-one".