21321313233 has 16 divisors (see below), whose sum is σ = 31851005376. Its totient is φ = 12572763840.

The previous prime is 21321313217. The next prime is 21321313243. The reversal of 21321313233 is 33231312312.

It is not a de Polignac number, because 21321313233 - 2⁴ = 21321313217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21321313243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8729866 + ... + 8732307.

It is an arithmetic number, because the mean of its divisors is an integer number (1990687836).

Almost surely, 2^21321313233 is an apocalyptic number.

It is an amenable number.

21321313233 is a deficient number, since it is larger than the sum of its proper divisors (10529692143).

21321313233 is a wasteful number, since it uses less digits than its factorization.

21321313233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17462224.

The product of its digits is 1944, while the sum is 24.

Adding to 21321313233 its reverse (33231312312), we get a palindrome (54552625545).

The spelling of 21321313233 in words is "twenty-one billion, three hundred twenty-one million, three hundred thirteen thousand, two hundred thirty-three".