21329364 has 48 divisors (see below), whose sum is σ = 58720256. Its totient is φ = 5896800.

The previous prime is 21329311. The next prime is 21329377. The reversal of 21329364 is 46392312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1492 + ... + 6699.

Almost surely, 2^21329364 is an apocalyptic number.

It is an amenable number.

21329364 is an abundant number, since it is smaller than the sum of its proper divisors (37390892).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21329364 is a wasteful number, since it uses less digits than its factorization.

21329364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8236 (or 8234 counting only the distinct ones).

The product of its digits is 7776, while the sum is 30.

The square root of 21329364 is about 4618.3724405899. The cubic root of 21329364 is about 277.3273075357.

The spelling of 21329364 in words is "twenty-one million, three hundred twenty-nine thousand, three hundred sixty-four".