21336924 has 96 divisors (see below), whose sum is σ = 62092800. Its totient is φ = 5564160.

The previous prime is 21336907. The next prime is 21336961. The reversal of 21336924 is 42963312.

It is a junction number, because it is equal to n+sod(n) for n = 21336891 and 21336900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46054 + ... + 46514.

It is an arithmetic number, because the mean of its divisors is an integer number (646800).

Almost surely, 2^21336924 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21336924, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31046400).

21336924 is an abundant number, since it is smaller than the sum of its proper divisors (40755876).

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

21336924 is a wasteful number, since it uses less digits than its factorization.

21336924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523 (or 521 counting only the distinct ones).

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

The square root of 21336924 is about 4619.1908382313. The cubic root of 21336924 is about 277.3600690499.

The spelling of 21336924 in words is "twenty-one million, three hundred thirty-six thousand, nine hundred twenty-four".