21112716 has 24 divisors (see below), whose sum is σ = 49351680. Its totient is φ = 7024912.

The previous prime is 21112711. The next prime is 21112717. The reversal of 21112716 is 61721112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21112692 and 21112701.

It is not an unprimeable number, because it can be changed into a prime (21112711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7405 + ... + 9851.

It is an arithmetic number, because the mean of its divisors is an integer number (2056320).

Almost surely, 2^21112716 is an apocalyptic number.

It is an amenable number.

21112716 is an abundant number, since it is smaller than the sum of its proper divisors (28238964).

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

21112716 is a wasteful number, since it uses less digits than its factorization.

21112716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3173 (or 3171 counting only the distinct ones).

The product of its digits is 168, while the sum is 21.

The square root of 21112716 is about 4594.8575603603. The cubic root of 21112716 is about 276.3851480700.

Adding to 21112716 its reverse (61721112), we get a palindrome (82833828).

The spelling of 21112716 in words is "twenty-one million, one hundred twelve thousand, seven hundred sixteen".