21131110033 has 12 divisors (see below), whose sum is σ = 23279724160. Its totient is φ = 19166293080.

The previous prime is 21131110027. The next prime is 21131110037. The reversal of 21131110033 is 33001113112.

It is not a de Polignac number, because 21131110033 - 2¹³ = 21131101841 is a prime.

It is a super-2 number, since 2×21131110033² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21131109989 and 21131110016.

It is not an unprimeable number, because it can be changed into a prime (21131110037) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 145785 + ... + 252022.

Almost surely, 2^21131110033 is an apocalyptic number.

It is an amenable number.

21131110033 is a deficient number, since it is larger than the sum of its proper divisors (2148614127).

21131110033 is a wasteful number, since it uses less digits than its factorization.

21131110033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398268 (or 398257 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 16.

Adding to 21131110033 its reverse (33001113112), we get a palindrome (54132223145).

The spelling of 21131110033 in words is "twenty-one billion, one hundred thirty-one million, one hundred ten thousand, thirty-three".