21322135 has 8 divisors (see below), whose sum is σ = 25611696. Its totient is φ = 17040960.

The previous prime is 21322129. The next prime is 21322139. The reversal of 21322135 is 53122312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21322135 - 2⁹ = 21321623 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 (21322139) 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 7 ways as a sum of consecutive naturals, for example, 7515 + ... + 9955.

It is an arithmetic number, because the mean of its divisors is an integer number (3201462).

Almost surely, 2^21322135 is an apocalyptic number.

21322135 is a deficient number, since it is larger than the sum of its proper divisors (4289561).

21322135 is a wasteful number, since it uses less digits than its factorization.

21322135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4193.

The product of its digits is 360, while the sum is 19.

The square root of 21322135 is about 4617.5897392471. The cubic root of 21322135 is about 277.2959731799.

Adding to 21322135 its reverse (53122312), we get a palindrome (74444447).

The spelling of 21322135 in words is "twenty-one million, three hundred twenty-two thousand, one hundred thirty-five".