21267133 has 2 divisors, whose sum is σ = 21267134. Its totient is φ = 21267132.

The previous prime is 21267107. The next prime is 21267149. The reversal of 21267133 is 33176212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21187609 + 79524 = 4603^2 + 282^2 .

It is a cyclic number.

It is not a de Polignac number, because 21267133 - 2²¹ = 19169981 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21267098 and 21267107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21207133) by changing a digit.

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 as a sum of consecutive naturals, namely, 10633566 + 10633567.

It is an arithmetic number, because the mean of its divisors is an integer number (10633567).

Almost surely, 2^21267133 is an apocalyptic number.

It is an amenable number.

21267133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21267133 is an equidigital number, since it uses as much as digits as its factorization.

21267133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 25.

The square root of 21267133 is about 4611.6301889896. The cubic root of 21267133 is about 277.0573328132.

The spelling of 21267133 in words is "twenty-one million, two hundred sixty-seven thousand, one hundred thirty-three".