21324076 has 6 divisors (see below), whose sum is σ = 37317140. Its totient is φ = 10662036.

The previous prime is 21324053. The next prime is 21324089. The reversal of 21324076 is 67042312.

It is a self number, because there is not a number n which added to its sum of digits gives 21324076.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2665506 + ... + 2665513.

Almost surely, 2^21324076 is an apocalyptic number.

It is an amenable number.

21324076 is a deficient number, since it is larger than the sum of its proper divisors (15993064).

21324076 is a wasteful number, since it uses less digits than its factorization.

21324076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5331023 (or 5331021 counting only the distinct ones).

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

The square root of 21324076 is about 4617.7999090476. The cubic root of 21324076 is about 277.3043872084.

Adding to 21324076 its reverse (67042312), we get a palindrome (88366388).

The spelling of 21324076 in words is "twenty-one million, three hundred twenty-four thousand, seventy-six".