21211321233 has 8 divisors (see below), whose sum is σ = 28300710528. Its totient is φ = 14131406384.

The previous prime is 21211321207. The next prime is 21211321247. The reversal of 21211321233 is 33212311212.

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 21211321233 - 2⁶ = 21211321169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21211323233) 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, 2363385 + ... + 2372342.

It is an arithmetic number, because the mean of its divisors is an integer number (3537588816).

Almost surely, 2^21211321233 is an apocalyptic number.

It is an amenable number.

21211321233 is a deficient number, since it is larger than the sum of its proper divisors (7089389295).

21211321233 is a wasteful number, since it uses less digits than its factorization.

21211321233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4737223.

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

Adding to 21211321233 its reverse (33212311212), we get a palindrome (54423632445).

The spelling of 21211321233 in words is "twenty-one billion, two hundred eleven million, three hundred twenty-one thousand, two hundred thirty-three".