21267306 has 32 divisors (see below), whose sum is σ = 50042880. Its totient is φ = 6671808.

The previous prime is 21267263. The next prime is 21267371. The reversal of 21267306 is 60376212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 21267306.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10666 + ... + 12501.

It is an arithmetic number, because the mean of its divisors is an integer number (1563840).

Almost surely, 2^21267306 is an apocalyptic number.

21267306 is an abundant number, since it is smaller than the sum of its proper divisors (28775574).

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

21267306 is a wasteful number, since it uses less digits than its factorization.

21267306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23195 (or 23189 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 21267306 is about 4611.6489458761. The cubic root of 21267306 is about 277.0580840630.

The spelling of 21267306 in words is "twenty-one million, two hundred sixty-seven thousand, three hundred six".