21124412 has 12 divisors (see below), whose sum is σ = 38242680. Its totient is φ = 10197936.

The previous prime is 21124391. The next prime is 21124459. The reversal of 21124412 is 21442112.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 90938 + ... + 91169.

It is an arithmetic number, because the mean of its divisors is an integer number (3186890).

Almost surely, 2^21124412 is an apocalyptic number.

It is an amenable number.

21124412 is a deficient number, since it is larger than the sum of its proper divisors (17118268).

21124412 is a wasteful number, since it uses less digits than its factorization.

21124412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182140 (or 182138 counting only the distinct ones).

The product of its digits is 128, while the sum is 17.

The square root of 21124412 is about 4596.1301113002. The cubic root of 21124412 is about 276.4361758321.

Adding to 21124412 its reverse (21442112), we get a palindrome (42566524).

The spelling of 21124412 in words is "twenty-one million, one hundred twenty-four thousand, four hundred twelve".