21110516 has 12 divisors (see below), whose sum is σ = 42221088. Its totient is φ = 9047352.

The previous prime is 21110513. The next prime is 21110543. The reversal of 21110516 is 61501112.

21110516 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21110494 and 21110503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110513) 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, 376946 + ... + 377001.

It is an arithmetic number, because the mean of its divisors is an integer number (3518424).

Almost surely, 2^21110516 is an apocalyptic number.

It is an amenable number.

21110516 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21110516 is a wasteful number, since it uses less digits than its factorization.

21110516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753958 (or 753956 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 17.

The square root of 21110516 is about 4594.6181560604. The cubic root of 21110516 is about 276.3755477191.

Adding to 21110516 its reverse (61501112), we get a palindrome (82611628).

The spelling of 21110516 in words is "twenty-one million, one hundred ten thousand, five hundred sixteen".