21736133 has 4 divisors (see below), whose sum is σ = 22880160. Its totient is φ = 20592108.

The previous prime is 21736111. The next prime is 21736151. The reversal of 21736133 is 33163712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21736133 - 2¹² = 21732037 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 (21736103) 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 3 ways as a sum of consecutive naturals, for example, 571985 + ... + 572022.

It is an arithmetic number, because the mean of its divisors is an integer number (5720040).

Almost surely, 2^21736133 is an apocalyptic number.

It is an amenable number.

21736133 is a deficient number, since it is larger than the sum of its proper divisors (1144027).

21736133 is a wasteful number, since it uses less digits than its factorization.

21736133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1144026.

The product of its digits is 2268, while the sum is 26.

The square root of 21736133 is about 4662.2025910507. The cubic root of 21736133 is about 279.0791731558.

Adding to 21736133 its reverse (33163712), we get a palindrome (54899845).

The spelling of 21736133 in words is "twenty-one million, seven hundred thirty-six thousand, one hundred thirty-three".