21727125 has 96 divisors (see below), whose sum is σ = 46725120. Its totient is φ = 9504000.

The previous prime is 21727117. The next prime is 21727183. The reversal of 21727125 is 52172712.

It is not a de Polignac number, because 21727125 - 2³ = 21727117 is a prime.

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 (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 244081 + ... + 244169.

It is an arithmetic number, because the mean of its divisors is an integer number (486720).

Almost surely, 2^21727125 is an apocalyptic number.

21727125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21727125 is an abundant number, since it is smaller than the sum of its proper divisors (24997995).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21727125 is a wasteful number, since it uses less digits than its factorization.

21727125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148 (or 135 counting only the distinct ones).

The product of its digits is 1960, while the sum is 27.

The square root of 21727125 is about 4661.2364239545. The cubic root of 21727125 is about 279.0406153536.

Adding to 21727125 its reverse (52172712), we get a palindrome (73899837).

The spelling of 21727125 in words is "twenty-one million, seven hundred twenty-seven thousand, one hundred twenty-five".