21135353 has 8 divisors (see below), whose sum is σ = 22384320. Its totient is φ = 19900080.

The previous prime is 21135349. The next prime is 21135371. The reversal of 21135353 is 35353112.

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

It is a cyclic number.

It is not a de Polignac number, because 21135353 - 2² = 21135349 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21135053) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158 + ... + 6503.

It is an arithmetic number, because the mean of its divisors is an integer number (2798040).

Almost surely, 2^21135353 is an apocalyptic number.

It is an amenable number.

21135353 is a deficient number, since it is larger than the sum of its proper divisors (1248967).

21135353 is a wasteful number, since it uses less digits than its factorization.

21135353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6847.

The product of its digits is 1350, while the sum is 23.

The square root of 21135353 is about 4597.3201976804. The cubic root of 21135353 is about 276.4838926031.

Adding to 21135353 its reverse (35353112), we get a palindrome (56488465).

The spelling of 21135353 in words is "twenty-one million, one hundred thirty-five thousand, three hundred fifty-three".