21267368 has 16 divisors (see below), whose sum is σ = 40272660. Its totient is φ = 10528000.

The previous prime is 21267263. The next prime is 21267371. The reversal of 21267368 is 86376212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15225604 + 6041764 = 3902^2 + 2458^2 .

It is a zygodrome in base 3.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12353 + ... + 13968.

Almost surely, 2^21267368 is an apocalyptic number.

It is an amenable number.

21267368 is a deficient number, since it is larger than the sum of its proper divisors (19005292).

21267368 is a wasteful number, since it uses less digits than its factorization.

21267368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26428 (or 26424 counting only the distinct ones).

The product of its digits is 24192, while the sum is 35.

The square root of 21267368 is about 4611.6556679787. The cubic root of 21267368 is about 277.0583532960.

The spelling of 21267368 in words is "twenty-one million, two hundred sixty-seven thousand, three hundred sixty-eight".