21267708 has 48 divisors (see below), whose sum is σ = 61872384. Its totient is φ = 5523840.

The previous prime is 21267689. The next prime is 21267713. The reversal of 21267708 is 80776212.

It is a Harshad number since it is a multiple of its sum of digits (33).

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 15 ways as a sum of consecutive naturals, for example, 10585 + ... + 12432.

It is an arithmetic number, because the mean of its divisors is an integer number (1289008).

Almost surely, 2^21267708 is an apocalyptic number.

21267708 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21267708 is an abundant number, since it is smaller than the sum of its proper divisors (40604676).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21267708 is a wasteful number, since it uses less digits than its factorization.

21267708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23042 (or 23040 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 33.

The square root of 21267708 is about 4611.6925309478. The cubic root of 21267708 is about 277.0598297260.

The spelling of 21267708 in words is "twenty-one million, two hundred sixty-seven thousand, seven hundred eight".