21331031311233 has 18 divisors (see below), whose sum is σ = 35841936965874. Its totient is φ = 12189160749024.

The previous prime is 21331031311217. The next prime is 21331031311237. The reversal of 21331031311233 is 33211313013312.

21331031311233 is a `hidden beast` number, since 2 + 1 + 3 + 310 + 3 + 1 + 311 + 2 + 33 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15744960512064 + 5586070799169 = 3967992^2 + 2363487^2 .

It is not a de Polignac number, because 21331031311233 - 2⁴ = 21331031311217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21331031311197 and 21331031311206.

It is not an unprimeable number, because it can be changed into a prime (21331031311237) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 24184842316 + ... + 24184843197.

Almost surely, 2^{21331031311233} is an apocalyptic number.

It is an amenable number.

21331031311233 is a deficient number, since it is larger than the sum of its proper divisors (14510905654641).

21331031311233 is a wasteful number, since it uses less digits than its factorization.

21331031311233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48369685533 (or 48369685523 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 27.

Adding to 21331031311233 its reverse (33211313013312), we get a palindrome (54542344324545).

The spelling of 21331031311233 in words is "twenty-one trillion, three hundred thirty-one billion, thirty-one million, three hundred eleven thousand, two hundred thirty-three".