21012324 has 24 divisors (see below), whose sum is σ = 49109760. Its totient is φ = 6992544.

The previous prime is 21012311. The next prime is 21012331. The reversal of 21012324 is 42321012.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 9342 + ... + 11370.

It is an arithmetic number, because the mean of its divisors is an integer number (2046240).

Almost surely, 2^21012324 is an apocalyptic number.

It is an amenable number.

21012324 is an abundant number, since it is smaller than the sum of its proper divisors (28097436).

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

21012324 is a wasteful number, since it uses less digits than its factorization.

21012324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2899 (or 2897 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21012324 is about 4583.9201563727. The cubic root of 21012324 is about 275.9463768960.

Adding to 21012324 its reverse (42321012), we get a palindrome (63333336).

The spelling of 21012324 in words is "twenty-one million, twelve thousand, three hundred twenty-four".