21302033 has 4 divisors (see below), whose sum is σ = 21558768. Its totient is φ = 21045300.

The previous prime is 21302027. The next prime is 21302051. The reversal of 21302033 is 33020312.

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 a cyclic number.

It is not a de Polignac number, because 21302033 - 2¹² = 21297937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21301999 and 21302017.

It is not an unprimeable number, because it can be changed into a prime (21302063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128243 + ... + 128408.

It is an arithmetic number, because the mean of its divisors is an integer number (5389692).

Almost surely, 2^21302033 is an apocalyptic number.

It is an amenable number.

21302033 is a deficient number, since it is larger than the sum of its proper divisors (256735).

21302033 is an equidigital number, since it uses as much as digits as its factorization.

21302033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256734.

The product of its (nonzero) digits is 108, while the sum is 14.

The square root of 21302033 is about 4615.4125492744. The cubic root of 21302033 is about 277.2088031051.

Adding to 21302033 its reverse (33020312), we get a palindrome (54322345).

The spelling of 21302033 in words is "twenty-one million, three hundred two thousand, thirty-three".