125056821 has 16 divisors (see below), whose sum is σ = 172659200. Its totient is φ = 80429760.

The previous prime is 125056807. The next prime is 125056823. The reversal of 125056821 is 128650521.

It is not a de Polignac number, because 125056821 - 2⁷ = 125056693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125056823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30531 + ... + 34383.

It is an arithmetic number, because the mean of its divisors is an integer number (10791200).

Almost surely, 2^125056821 is an apocalyptic number.

It is an amenable number.

125056821 is a deficient number, since it is larger than the sum of its proper divisors (47602379).

125056821 is a wasteful number, since it uses less digits than its factorization.

125056821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4236.

The product of its (nonzero) digits is 4800, while the sum is 30.

The square root of 125056821 is about 11182.8807111585. The cubic root of 125056821 is about 500.0757498567.

The spelling of 125056821 in words is "one hundred twenty-five million, fifty-six thousand, eight hundred twenty-one".