21124468 has 6 divisors (see below), whose sum is σ = 36967826. Its totient is φ = 10562232.

The previous prime is 21124463. The next prime is 21124469. The reversal of 21124468 is 86442112.

It can be written as a sum of positive squares in only one way, i.e., 19820304 + 1304164 = 4452^2 + 1142^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124463) 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 as a sum of consecutive naturals, namely, 2640555 + ... + 2640562.

Almost surely, 2^21124468 is an apocalyptic number.

It is an amenable number.

21124468 is a deficient number, since it is larger than the sum of its proper divisors (15843358).

21124468 is a wasteful number, since it uses less digits than its factorization.

21124468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5281121 (or 5281119 counting only the distinct ones).

The product of its digits is 3072, while the sum is 28.

The square root of 21124468 is about 4596.1362033778. The cubic root of 21124468 is about 276.4364201057.

The spelling of 21124468 in words is "twenty-one million, one hundred twenty-four thousand, four hundred sixty-eight".