21324670 has 8 divisors (see below), whose sum is σ = 38384424. Its totient is φ = 8529864.

The previous prime is 21324661. The next prime is 21324671. The reversal of 21324670 is 7642312.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21324671) 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, 1066224 + ... + 1066243.

It is an arithmetic number, because the mean of its divisors is an integer number (4798053).

Almost surely, 2^21324670 is an apocalyptic number.

21324670 is a deficient number, since it is larger than the sum of its proper divisors (17059754).

21324670 is a wasteful number, since it uses less digits than its factorization.

21324670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2132474.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 21324670 is about 4617.8642249421. The cubic root of 21324670 is about 277.3069620332.

Adding to 21324670 its reverse (7642312), we get a palindrome (28966982).

The spelling of 21324670 in words is "twenty-one million, three hundred twenty-four thousand, six hundred seventy".