21124330 has 32 divisors (see below), whose sum is σ = 39771648. Its totient is φ = 8068800.

The previous prime is 21124321. The next prime is 21124339. The reversal of 21124330 is 3342112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21124321) and next prime (21124339).

It is not an unprimeable number, because it can be changed into a prime (21124339) 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 15 ways as a sum of consecutive naturals, for example, 25320 + ... + 26140.

It is an arithmetic number, because the mean of its divisors is an integer number (1242864).

Almost surely, 2^21124330 is an apocalyptic number.

21124330 is a deficient number, since it is larger than the sum of its proper divisors (18647318).

21124330 is a wasteful number, since it uses less digits than its factorization.

21124330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 942.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 21124330 is about 4596.1211907433. The cubic root of 21124330 is about 276.4358181449.

Adding to 21124330 its reverse (3342112), we get a palindrome (24466442).

The spelling of 21124330 in words is "twenty-one million, one hundred twenty-four thousand, three hundred thirty".