21523485 has 16 divisors (see below), whose sum is σ = 36250560. Its totient is φ = 10874880.

The previous prime is 21523433. The next prime is 21523499. The reversal of 21523485 is 58432512.

It is not a de Polignac number, because 21523485 - 2⁶ = 21523421 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 37476 + ... + 38045.

It is an arithmetic number, because the mean of its divisors is an integer number (2265660).

Almost surely, 2^21523485 is an apocalyptic number.

It is an amenable number.

21523485 is a deficient number, since it is larger than the sum of its proper divisors (14727075).

21523485 is a wasteful number, since it uses less digits than its factorization.

21523485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75548.

The product of its digits is 9600, while the sum is 30.

The square root of 21523485 is about 4639.3410092383. The cubic root of 21523485 is about 278.1660972809.

Adding to 21523485 its reverse (58432512), we get a palindrome (79955997).

The spelling of 21523485 in words is "twenty-one million, five hundred twenty-three thousand, four hundred eighty-five".