21324874 has 8 divisors (see below), whose sum is σ = 32010048. Its totient is φ = 10654860.

The previous prime is 21324871. The next prime is 21324881. The reversal of 21324874 is 47842312.

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

It is a super-2 number, since 2×21324874² = 909500502231752, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21324871) 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, 879 + ... + 6589.

It is an arithmetic number, because the mean of its divisors is an integer number (4001256).

Almost surely, 2^21324874 is an apocalyptic number.

21324874 is a deficient number, since it is larger than the sum of its proper divisors (10685174).

21324874 is a wasteful number, since it uses less digits than its factorization.

21324874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7580.

The product of its digits is 10752, while the sum is 31.

The square root of 21324874 is about 4617.8863130224. The cubic root of 21324874 is about 277.3078463054.

The spelling of 21324874 in words is "twenty-one million, three hundred twenty-four thousand, eight hundred seventy-four".