21541125 has 64 divisors (see below), whose sum is σ = 39536640. Its totient is φ = 10368000.

The previous prime is 21541099. The next prime is 21541127. The reversal of 21541125 is 52114512.

It is not a de Polignac number, because 21541125 - 2⁶ = 21541061 is a prime.

It is a super-3 number, since 3×21541125³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21541127) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 197571 + ... + 197679.

It is an arithmetic number, because the mean of its divisors is an integer number (617760).

Almost surely, 2^21541125 is an apocalyptic number.

21541125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21541125 is a deficient number, since it is larger than the sum of its proper divisors (17995515).

21541125 is a wasteful number, since it uses less digits than its factorization.

21541125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175 (or 165 counting only the distinct ones).

The product of its digits is 400, while the sum is 21.

The square root of 21541125 is about 4641.2417519453. The cubic root of 21541125 is about 278.2420687149.

Adding to 21541125 its reverse (52114512), we get a palindrome (73655637).

The spelling of 21541125 in words is "twenty-one million, five hundred forty-one thousand, one hundred twenty-five".