21060125 has 8 divisors (see below), whose sum is σ = 26283192. Its totient is φ = 16848000.

The previous prime is 21060097. The next prime is 21060131. The reversal of 21060125 is 52106012.

It can be written as a sum of positive squares in 4 ways, for example, as 683929 + 20376196 = 827^2 + 4514^2 .

It is not a de Polignac number, because 21060125 - 2¹² = 21056029 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84116 + ... + 84365.

It is an arithmetic number, because the mean of its divisors is an integer number (3285399).

Almost surely, 2^21060125 is an apocalyptic number.

21060125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21060125 is a deficient number, since it is larger than the sum of its proper divisors (5223067).

21060125 is an equidigital number, since it uses as much as digits as its factorization.

21060125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168496 (or 168486 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 21060125 is about 4589.1311813893. The cubic root of 21060125 is about 276.1554688398.

Adding to 21060125 its reverse (52106012), we get a palindrome (73166137).

The spelling of 21060125 in words is "twenty-one million, sixty thousand, one hundred twenty-five".