21266343 has 36 divisors (see below), whose sum is σ = 36259600. Its totient is φ = 12005784.

The previous prime is 21266327. The next prime is 21266389. The reversal of 21266343 is 34366212.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

21266343 is a `hidden beast` number, since 2 + 1 + 26 + 634 + 3 = 666.

It is not a de Polignac number, because 21266343 - 2⁴ = 21266327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21266393) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 256180 + ... + 256262.

Almost surely, 2^21266343 is an apocalyptic number.

21266343 is a deficient number, since it is larger than the sum of its proper divisors (14993257).

21266343 is an frugal number, since it uses more digits than its factorization.

21266343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193 (or 93 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

The square root of 21266343 is about 4611.5445351856. The cubic root of 21266343 is about 277.0539021987.

It can be divided in two parts, 21266 and 343, that added together give a square (21609 = 147²).

The spelling of 21266343 in words is "twenty-one million, two hundred sixty-six thousand, three hundred forty-three".