125054021 has 4 divisors (see below), whose sum is σ = 125496192. Its totient is φ = 124611852.

The previous prime is 125054009. The next prime is 125054063. The reversal of 125054021 is 120450521.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125054021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 125053984 and 125054002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125054821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220661 + ... + 221226.

It is an arithmetic number, because the mean of its divisors is an integer number (31374048).

Almost surely, 2^125054021 is an apocalyptic number.

It is an amenable number.

125054021 is a deficient number, since it is larger than the sum of its proper divisors (442171).

125054021 is an equidigital number, since it uses as much as digits as its factorization.

125054021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442170.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 125054021 is about 11182.7555191017. The cubic root of 125054021 is about 500.0720176264.

The spelling of 125054021 in words is "one hundred twenty-five million, fifty-four thousand, twenty-one".