21023324 has 24 divisors (see below), whose sum is σ = 43074528. Its totient is φ = 8789760.

The previous prime is 21023323. The next prime is 21023341. The reversal of 21023324 is 42332012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8009 + ... + 10304.

It is an arithmetic number, because the mean of its divisors is an integer number (1794772).

Almost surely, 2^21023324 is an apocalyptic number.

It is an amenable number.

21023324 is an abundant number, since it is smaller than the sum of its proper divisors (22051204).

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

21023324 is a wasteful number, since it uses less digits than its factorization.

21023324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18365 (or 18363 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 21023324 is about 4585.1198457619. The cubic root of 21023324 is about 275.9945213503.

Adding to 21023324 its reverse (42332012), we get a palindrome (63355336).

The spelling of 21023324 in words is "twenty-one million, twenty-three thousand, three hundred twenty-four".