21200311233 has 6 divisors (see below), whose sum is σ = 30622671794. Its totient is φ = 14133540816.

The previous prime is 21200311229. The next prime is 21200311241. The reversal of 21200311233 is 33211300212.

21200311233 is a `hidden beast` number, since 2 + 120 + 0 + 311 + 233 = 666.

It can be written as a sum of positive squares in only one way, i.e., 14392081089 + 6808230144 = 119967^2 + 82512^2 .

It is not a de Polignac number, because 21200311233 - 2² = 21200311229 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21200311213) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1177795060 + ... + 1177795077.

Almost surely, 2^21200311233 is an apocalyptic number.

It is an amenable number.

21200311233 is a deficient number, since it is larger than the sum of its proper divisors (9422360561).

21200311233 is a wasteful number, since it uses less digits than its factorization.

21200311233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2355590143 (or 2355590140 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21200311233 its reverse (33211300212), we get a palindrome (54411611445).

The spelling of 21200311233 in words is "twenty-one billion, two hundred million, three hundred eleven thousand, two hundred thirty-three".