21133122321 has 32 divisors (see below), whose sum is σ = 28918581120. Its totient is φ = 13722508800.

The previous prime is 21133122319. The next prime is 21133122337. The reversal of 21133122321 is 12322133112.

It is not a de Polignac number, because 21133122321 - 2¹ = 21133122319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21133122301) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14788035 + ... + 14789463.

It is an arithmetic number, because the mean of its divisors is an integer number (903705660).

Almost surely, 2^21133122321 is an apocalyptic number.

It is an amenable number.

21133122321 is a deficient number, since it is larger than the sum of its proper divisors (7785458799).

21133122321 is a wasteful number, since it uses less digits than its factorization.

21133122321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2097.

The product of its digits is 432, while the sum is 21.

Adding to 21133122321 its reverse (12322133112), we get a palindrome (33455255433).

The spelling of 21133122321 in words is "twenty-one billion, one hundred thirty-three million, one hundred twenty-two thousand, three hundred twenty-one".