21133232321 has 8 divisors (see below), whose sum is σ = 23147962920. Its totient is φ = 19204235008.

The previous prime is 21133232303. The next prime is 21133232369. The reversal of 21133232321 is 12323233112.

It can be written as a sum of positive squares in 4 ways, for example, as 964972096 + 20168260225 = 31064^2 + 142015^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21133232321 - 2⁶ = 21133232257 is a prime.

It is a super-2 number, since 2×21133232321² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21133232371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21432806 + ... + 21433791.

It is an arithmetic number, because the mean of its divisors is an integer number (2893495365).

Almost surely, 2^21133232321 is an apocalyptic number.

It is an amenable number.

21133232321 is a deficient number, since it is larger than the sum of its proper divisors (2014730599).

21133232321 is a wasteful number, since it uses less digits than its factorization.

21133232321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42866643.

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

Adding to 21133232321 its reverse (12323233112), we get a palindrome (33456465433).

The spelling of 21133232321 in words is "twenty-one billion, one hundred thirty-three million, two hundred thirty-two thousand, three hundred twenty-one".