21324807 has 48 divisors (see below), whose sum is σ = 37140480. Its totient is φ = 11534400.

The previous prime is 21324803. The next prime is 21324847. The reversal of 21324807 is 70842312.

It is not a de Polignac number, because 21324807 - 2² = 21324803 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21324803) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 119044 + ... + 119222.

It is an arithmetic number, because the mean of its divisors is an integer number (773760).

Almost surely, 2^21324807 is an apocalyptic number.

21324807 is a deficient number, since it is larger than the sum of its proper divisors (15815673).

21324807 is a wasteful number, since it uses less digits than its factorization.

21324807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284 (or 281 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 21324807 is about 4617.8790586155. The cubic root of 21324807 is about 277.3075558833.

The spelling of 21324807 in words is "twenty-one million, three hundred twenty-four thousand, eight hundred seven".