21827516 has 6 divisors (see below), whose sum is σ = 38198160. Its totient is φ = 10913756.

The previous prime is 21827513. The next prime is 21827527. The reversal of 21827516 is 61572812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21827513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2728436 + ... + 2728443.

It is an arithmetic number, because the mean of its divisors is an integer number (6366360).

Almost surely, 2^21827516 is an apocalyptic number.

It is an amenable number.

21827516 is a deficient number, since it is larger than the sum of its proper divisors (16370644).

21827516 is a wasteful number, since it uses less digits than its factorization.

21827516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5456883 (or 5456881 counting only the distinct ones).

The product of its digits is 6720, while the sum is 32.

The square root of 21827516 is about 4671.9927225971. The cubic root of 21827516 is about 279.4697276810.

The spelling of 21827516 in words is "twenty-one million, eight hundred twenty-seven thousand, five hundred sixteen".