21268798 has 8 divisors (see below), whose sum is σ = 32004792. Its totient is φ = 10600536.

The previous prime is 21268787. The next prime is 21268801. The reversal of 21268798 is 89786212.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 16140 + ... + 17407.

It is an arithmetic number, because the mean of its divisors is an integer number (4000599).

Almost surely, 2^21268798 is an apocalyptic number.

21268798 is a deficient number, since it is larger than the sum of its proper divisors (10735994).

21268798 is a wasteful number, since it uses less digits than its factorization.

21268798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33866.

The product of its digits is 96768, while the sum is 43.

The square root of 21268798 is about 4611.8107073036. The cubic root of 21268798 is about 277.0645628807.

The spelling of 21268798 in words is "twenty-one million, two hundred sixty-eight thousand, seven hundred ninety-eight".