21320033 has 16 divisors (see below), whose sum is σ = 26480640. Its totient is φ = 16750800.

The previous prime is 21320021. The next prime is 21320051. The reversal of 21320033 is 33002312.

It is a cyclic number.

It is not a de Polignac number, because 21320033 - 2⁸ = 21319777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21320053) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1538 + ... + 6708.

It is an arithmetic number, because the mean of its divisors is an integer number (1655040).

Almost surely, 2^21320033 is an apocalyptic number.

It is an amenable number.

21320033 is a deficient number, since it is larger than the sum of its proper divisors (5160607).

21320033 is a wasteful number, since it uses less digits than its factorization.

21320033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5228.

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

The square root of 21320033 is about 4617.3621257164. The cubic root of 21320033 is about 277.2868606577.

Adding to 21320033 its reverse (33002312), we get a palindrome (54322345).

The spelling of 21320033 in words is "twenty-one million, three hundred twenty thousand, thirty-three".