21650133 has 4 divisors (see below), whose sum is σ = 28866848. Its totient is φ = 14433420.

The previous prime is 21650131. The next prime is 21650137. The reversal of 21650133 is 33105612.

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 not a de Polignac number, because 21650133 - 2¹ = 21650131 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 (21650131) 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, 3608353 + ... + 3608358.

It is an arithmetic number, because the mean of its divisors is an integer number (7216712).

Almost surely, 2^21650133 is an apocalyptic number.

It is an amenable number.

21650133 is a deficient number, since it is larger than the sum of its proper divisors (7216715).

21650133 is an equidigital number, since it uses as much as digits as its factorization.

21650133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7216714.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 21650133 is about 4652.9703416205. The cubic root of 21650133 is about 278.7106235142.

Adding to 21650133 its reverse (33105612), we get a palindrome (54755745).

The spelling of 21650133 in words is "twenty-one million, six hundred fifty thousand, one hundred thirty-three".