21032333321 has 4 divisors (see below), whose sum is σ = 21038190612. Its totient is φ = 21026476032.

The previous prime is 21032333269. The next prime is 21032333323. The reversal of 21032333321 is 12333323012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15484318096 + 5548015225 = 124436^2 + 74485^2 .

It is a cyclic number.

It is not a de Polignac number, because 21032333321 - 2¹⁰ = 21032332297 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 (21032333323) 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, 2923256 + ... + 2930441.

It is an arithmetic number, because the mean of its divisors is an integer number (5259547653).

Almost surely, 2^21032333321 is an apocalyptic number.

It is an amenable number.

21032333321 is a deficient number, since it is larger than the sum of its proper divisors (5857291).

21032333321 is an equidigital number, since it uses as much as digits as its factorization.

21032333321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5857290.

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 21032333321 its reverse (12333323012), we get a palindrome (33365656333).

The spelling of 21032333321 in words is "twenty-one billion, thirty-two million, three hundred thirty-three thousand, three hundred twenty-one".