21301133 has 6 divisors (see below), whose sum is σ = 24778926. Its totient is φ = 18258072.

The previous prime is 21301097. The next prime is 21301157. The reversal of 21301133 is 33110312.

It can be written as a sum of positive squares in only one way, i.e., 19695844 + 1605289 = 4438^2 + 1267^2 .

It is not a de Polignac number, because 21301133 - 2⁶ = 21301069 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21301193) 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 in 5 ways as a sum of consecutive naturals, for example, 217310 + ... + 217407.

It is an arithmetic number, because the mean of its divisors is an integer number (4129821).

Almost surely, 2^21301133 is an apocalyptic number.

It is an amenable number.

21301133 is a deficient number, since it is larger than the sum of its proper divisors (3477793).

21301133 is an equidigital number, since it uses as much as digits as its factorization.

21301133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434731 (or 434724 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 21301133 is about 4615.3150488347. The cubic root of 21301133 is about 277.2048990734.

Adding to 21301133 its reverse (33110312), we get a palindrome (54411445).

The spelling of 21301133 in words is "twenty-one million, three hundred one thousand, one hundred thirty-three".