21120016 has 20 divisors (see below), whose sum is σ = 41140224. Its totient is φ = 10503200.

The previous prime is 21119999. The next prime is 21120017. The reversal of 21120016 is 61002112.

It is a junction number, because it is equal to n+sod(n) for n = 21119978 and 21120005.

It is not an unprimeable number, because it can be changed into a prime (21120017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 400 + ... + 6511.

Almost surely, 2^21120016 is an apocalyptic number.

It is an amenable number.

21120016 is a deficient number, since it is larger than the sum of its proper divisors (20020208).

21120016 is a wasteful number, since it uses less digits than its factorization.

21120016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7110 (or 7104 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 21120016 is about 4595.6518580067. The cubic root of 21120016 is about 276.4169990027.

Adding to 21120016 its reverse (61002112), we get a palindrome (82122128).

The spelling of 21120016 in words is "twenty-one million, one hundred twenty thousand, sixteen".