21301433321 has 12 divisors (see below), whose sum is σ = 24783259140. Its totient is φ = 18255394080.

The previous prime is 21301433269. The next prime is 21301433323. The reversal of 21301433321 is 12333410312.

It can be written as a sum of positive squares in 2 ways, for example, as 17015898025 + 4285535296 = 130445^2 + 65464^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21301433321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21301433323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 300215 + ... + 364323.

It is an arithmetic number, because the mean of its divisors is an integer number (2065271595).

Almost surely, 2^21301433321 is an apocalyptic number.

It is an amenable number.

21301433321 is a deficient number, since it is larger than the sum of its proper divisors (3481825819).

21301433321 is an equidigital number, since it uses as much as digits as its factorization.

21301433321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70904 (or 70897 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21301433321 its reverse (12333410312), we get a palindrome (33634843633).

The spelling of 21301433321 in words is "twenty-one billion, three hundred one million, four hundred thirty-three thousand, three hundred twenty-one".