21353433 has 8 divisors (see below), whose sum is σ = 28495296. Its totient is φ = 14223600.

The previous prime is 21353419. The next prime is 21353441. The reversal of 21353433 is 33435312.

It is a happy number.

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

It is not a de Polignac number, because 21353433 - 2⁴ = 21353417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21353443) 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, 2668 + ... + 7058.

It is an arithmetic number, because the mean of its divisors is an integer number (3561912).

Almost surely, 2^21353433 is an apocalyptic number.

It is an amenable number.

21353433 is a deficient number, since it is larger than the sum of its proper divisors (7141863).

21353433 is a wasteful number, since it uses less digits than its factorization.

21353433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6015.

The product of its digits is 3240, while the sum is 24.

The square root of 21353433 is about 4620.9774939941. The cubic root of 21353433 is about 277.4315844651.

Adding to 21353433 its reverse (33435312), we get a palindrome (54788745).

The spelling of 21353433 in words is "twenty-one million, three hundred fifty-three thousand, four hundred thirty-three".