21266337 has 16 divisors (see below), whose sum is σ = 30119040. Its totient is φ = 13300992.

The previous prime is 21266327. The next prime is 21266389. The reversal of 21266337 is 73366212.

It is not a de Polignac number, because 21266337 - 2⁴ = 21266321 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 25239 + ... + 26067.

It is an arithmetic number, because the mean of its divisors is an integer number (1882440).

Almost surely, 2^21266337 is an apocalyptic number.

It is an amenable number.

21266337 is a deficient number, since it is larger than the sum of its proper divisors (8852703).

21266337 is a wasteful number, since it uses less digits than its factorization.

21266337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1352.

The product of its digits is 9072, while the sum is 30.

The square root of 21266337 is about 4611.5438846443. The cubic root of 21266337 is about 277.0538761431.

The spelling of 21266337 in words is "twenty-one million, two hundred sixty-six thousand, three hundred thirty-seven".