21324797 has 8 divisors (see below), whose sum is σ = 23525880. Its totient is φ = 19203840.

The previous prime is 21324791. The next prime is 21324803. The reversal of 21324797 is 79742312.

It is an interprime number because it is at equal distance from previous prime (21324791) and next prime (21324803).

It can be written as a sum of positive squares in 4 ways, for example, as 1779556 + 19545241 = 1334^2 + 4421^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21324797 - 2⁴ = 21324781 is a prime.

It is a Duffinian number.

21324797 is a modest number, since divided by 4797 gives 2132 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21324791) 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, 19472 + ... + 20537.

It is an arithmetic number, because the mean of its divisors is an integer number (2940735).

Almost surely, 2^21324797 is an apocalyptic number.

It is an amenable number.

21324797 is a deficient number, since it is larger than the sum of its proper divisors (2201083).

21324797 is a wasteful number, since it uses less digits than its factorization.

21324797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40063.

The product of its digits is 21168, while the sum is 35.

The square root of 21324797 is about 4617.8779758673. The cubic root of 21324797 is about 277.3075125366.

It can be divided in two parts, 2132 and 4797, that multiplied together give a square (10227204 = 3198²).

The spelling of 21324797 in words is "twenty-one million, three hundred twenty-four thousand, seven hundred ninety-seven".