21201133 has 2 divisors, whose sum is σ = 21201134. Its totient is φ = 21201132.

The previous prime is 21201127. The next prime is 21201137. The reversal of 21201133 is 33110212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20958084 + 243049 = 4578^2 + 493^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21201133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21201137) 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, 10600566 + 10600567.

It is an arithmetic number, because the mean of its divisors is an integer number (10600567).

Almost surely, 2^21201133 is an apocalyptic number.

It is an amenable number.

21201133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201133 is an equidigital number, since it uses as much as digits as its factorization.

21201133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 21201133 is about 4604.4688075825. The cubic root of 21201133 is about 276.7704310705.

Adding to 21201133 its reverse (33110212), we get a palindrome (54311345).

The spelling of 21201133 in words is "twenty-one million, two hundred one thousand, one hundred thirty-three".