21266316 has 36 divisors (see below), whose sum is σ = 53911312. Its totient is φ = 7068384.

The previous prime is 21266299. The next prime is 21266317. The reversal of 21266316 is 61366212.

21266316 is a `hidden beast` number, since 2 + 1 + 26 + 631 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 21266316.

It is not an unprimeable number, because it can be changed into a prime (21266317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16926 + ... + 18138.

Almost surely, 2^21266316 is an apocalyptic number.

It is an amenable number.

21266316 is an abundant number, since it is smaller than the sum of its proper divisors (32644996).

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

21266316 is a wasteful number, since it uses less digits than its factorization.

21266316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1710 (or 1705 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 21266316 is about 4611.5416077490. The cubic root of 21266316 is about 277.0537849484.

The spelling of 21266316 in words is "twenty-one million, two hundred sixty-six thousand, three hundred sixteen".