21033124 has 12 divisors (see below), whose sum is σ = 42066304. Its totient is φ = 9014184.

The previous prime is 21033121. The next prime is 21033127. The reversal of 21033124 is 42133012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21033121) and next prime (21033127).

21033124 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21033098 and 21033107.

It is not an unprimeable number, because it can be changed into a prime (21033121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 375564 + ... + 375619.

Almost surely, 2^21033124 is an apocalyptic number.

It is an amenable number.

21033124 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21033124 is a wasteful number, since it uses less digits than its factorization.

21033124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 751194 (or 751192 counting only the distinct ones).

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

The square root of 21033124 is about 4586.1883956070. The cubic root of 21033124 is about 276.0373995388.

Adding to 21033124 its reverse (42133012), we get a palindrome (63166136).

The spelling of 21033124 in words is "twenty-one million, thirty-three thousand, one hundred twenty-four".