21352133 has 4 divisors (see below), whose sum is σ = 23293248. Its totient is φ = 19411020.

The previous prime is 21352127. The next prime is 21352139. The reversal of 21352133 is 33125312.

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 an interprime number because it is at equal distance from previous prime (21352127) and next prime (21352139).

It is a cyclic number.

It is not a de Polignac number, because 21352133 - 2⁶ = 21352069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21352139) 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, 970541 + ... + 970562.

It is an arithmetic number, because the mean of its divisors is an integer number (5823312).

Almost surely, 2^21352133 is an apocalyptic number.

It is an amenable number.

21352133 is a deficient number, since it is larger than the sum of its proper divisors (1941115).

21352133 is a wasteful number, since it uses less digits than its factorization.

21352133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1941114.

The product of its digits is 540, while the sum is 20.

The square root of 21352133 is about 4620.8368289737. The cubic root of 21352133 is about 277.4259543262.

Adding to 21352133 its reverse (33125312), we get a palindrome (54477445).

The spelling of 21352133 in words is "twenty-one million, three hundred fifty-two thousand, one hundred thirty-three".