21524116 has 24 divisors (see below), whose sum is σ = 38525760. Its totient is φ = 10519872.

The previous prime is 21524099. The next prime is 21524117. The reversal of 21524116 is 61142512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21524117) by changing a digit.

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, 36375 + ... + 36961.

It is an arithmetic number, because the mean of its divisors is an integer number (1605240).

Almost surely, 2^21524116 is an apocalyptic number.

It is an amenable number.

21524116 is a deficient number, since it is larger than the sum of its proper divisors (17001644).

21524116 is a wasteful number, since it uses less digits than its factorization.

21524116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783 (or 781 counting only the distinct ones).

The product of its digits is 480, while the sum is 22.

The square root of 21524116 is about 4639.4090140879. The cubic root of 21524116 is about 278.1688155689.

Adding to 21524116 its reverse (61142512), we get a palindrome (82666628).

The spelling of 21524116 in words is "twenty-one million, five hundred twenty-four thousand, one hundred sixteen".