125766021 has 4 divisors (see below), whose sum is σ = 167688032. Its totient is φ = 83844012.

The previous prime is 125766019. The next prime is 125766023. The reversal of 125766021 is 120667521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (125766019) and next prime (125766023).

It is not a de Polignac number, because 125766021 - 2¹ = 125766019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 125766021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125766023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20961001 + ... + 20961006.

It is an arithmetic number, because the mean of its divisors is an integer number (41922008).

Almost surely, 2^125766021 is an apocalyptic number.

It is an amenable number.

125766021 is a deficient number, since it is larger than the sum of its proper divisors (41922011).

125766021 is an equidigital number, since it uses as much as digits as its factorization.

125766021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41922010.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 125766021 is about 11214.5450643350. The cubic root of 125766021 is about 501.0192820496.

The spelling of 125766021 in words is "one hundred twenty-five million, seven hundred sixty-six thousand, twenty-one".