21268024 has 8 divisors (see below), whose sum is σ = 39877560. Its totient is φ = 10634008.

The previous prime is 21268019. The next prime is 21268033. The reversal of 21268024 is 42086212.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 21268024.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1329244 + ... + 1329259.

It is an arithmetic number, because the mean of its divisors is an integer number (4984695).

Almost surely, 2^21268024 is an apocalyptic number.

It is an amenable number.

21268024 is a deficient number, since it is larger than the sum of its proper divisors (18609536).

21268024 is a wasteful number, since it uses less digits than its factorization.

21268024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2658509 (or 2658505 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 21268024 is about 4611.7267915608. The cubic root of 21268024 is about 277.0612019233.

The spelling of 21268024 in words is "twenty-one million, two hundred sixty-eight thousand, twenty-four".