125101821 has 8 divisors (see below), whose sum is σ = 179633440. Its totient is φ = 76985712.

The previous prime is 125101819. The next prime is 125101829. The reversal of 125101821 is 128101521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 125101821 - 2¹ = 125101819 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 (125101829) 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 in 7 ways as a sum of consecutive naturals, for example, 1603831 + ... + 1603908.

It is an arithmetic number, because the mean of its divisors is an integer number (22454180).

Almost surely, 2^125101821 is an apocalyptic number.

It is an amenable number.

125101821 is a deficient number, since it is larger than the sum of its proper divisors (54531619).

125101821 is a wasteful number, since it uses less digits than its factorization.

125101821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3207755.

The product of its (nonzero) digits is 160, while the sum is 21.

The square root of 125101821 is about 11184.8925341283. The cubic root of 125101821 is about 500.1357244877.

The spelling of 125101821 in words is "one hundred twenty-five million, one hundred one thousand, eight hundred twenty-one".