21441525 has 24 divisors (see below), whose sum is σ = 40515264. Its totient is φ = 9801600.

The previous prime is 21441523. The next prime is 21441533. The reversal of 21441525 is 52514412.

It is not a de Polignac number, because 21441525 - 2¹ = 21441523 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21441495 and 21441504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21441523) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19896 + ... + 20945.

It is an arithmetic number, because the mean of its divisors is an integer number (1688136).

Almost surely, 2^21441525 is an apocalyptic number.

21441525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21441525 is a deficient number, since it is larger than the sum of its proper divisors (19073739).

21441525 is a wasteful number, since it uses less digits than its factorization.

21441525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40861 (or 40856 counting only the distinct ones).

The product of its digits is 1600, while the sum is 24.

The square root of 21441525 is about 4630.4994331065. The cubic root of 21441525 is about 277.8125688275.

Adding to 21441525 its reverse (52514412), we get a palindrome (73955937).

It can be divided in two parts, 21 and 441525, that multiplied together give a square (9272025 = 3045²).

The spelling of 21441525 in words is "twenty-one million, four hundred forty-one thousand, five hundred twenty-five".