21324716 has 12 divisors (see below), whose sum is σ = 42649488. Its totient is φ = 9139152.

The previous prime is 21324713. The next prime is 21324727. The reversal of 21324716 is 61742312.

21324716 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21324713) 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, 380771 + ... + 380826.

It is an arithmetic number, because the mean of its divisors is an integer number (3554124).

Almost surely, 2^21324716 is an apocalyptic number.

It is an amenable number.

21324716 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.

21324716 is a wasteful number, since it uses less digits than its factorization.

21324716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761608 (or 761606 counting only the distinct ones).

The product of its digits is 2016, while the sum is 26.

The square root of 21324716 is about 4617.8692055969. The cubic root of 21324716 is about 277.3071614284.

The spelling of 21324716 in words is "twenty-one million, three hundred twenty-four thousand, seven hundred sixteen".