21024364 has 12 divisors (see below), whose sum is σ = 36843688. Its totient is φ = 10497600.

The previous prime is 21024361. The next prime is 21024373. The reversal of 21024364 is 46342012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21024361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4 + ... + 6484.

Almost surely, 2^21024364 is an apocalyptic number.

It is an amenable number.

21024364 is a deficient number, since it is larger than the sum of its proper divisors (15819324).

21024364 is a wasteful number, since it uses less digits than its factorization.

21024364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7296 (or 7294 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 21024364 is about 4585.2332546993. The cubic root of 21024364 is about 275.9990723206. Note that the first 3 decimals are identical.

Adding to 21024364 its reverse (46342012), we get a palindrome (67366376).

The spelling of 21024364 in words is "twenty-one million, twenty-four thousand, three hundred sixty-four".