21526116 has 12 divisors (see below), whose sum is σ = 50227632. Its totient is φ = 7175368.

The previous prime is 21526103. The next prime is 21526117. The reversal of 21526116 is 61162512.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×21526116³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21526117) 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 3 ways as a sum of consecutive naturals, for example, 896910 + ... + 896933.

It is an arithmetic number, because the mean of its divisors is an integer number (4185636).

Almost surely, 2^21526116 is an apocalyptic number.

It is an amenable number.

21526116 is an abundant number, since it is smaller than the sum of its proper divisors (28701516).

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

21526116 is a wasteful number, since it uses less digits than its factorization.

21526116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1793850 (or 1793848 counting only the distinct ones).

The product of its digits is 720, while the sum is 24.

The square root of 21526116 is about 4639.6245537759. The cubic root of 21526116 is about 278.1774310276.

Adding to 21526116 its reverse (61162512), we get a palindrome (82688628).

The spelling of 21526116 in words is "twenty-one million, five hundred twenty-six thousand, one hundred sixteen".