21110033331 has 12 divisors (see below), whose sum is σ = 30794175360. Its totient is φ = 13934014800.

The previous prime is 21110033311. The next prime is 21110033359. The reversal of 21110033331 is 13333001112.

It is a happy number.

It is not a de Polignac number, because 21110033331 - 2⁶ = 21110033267 is a prime.

It is a super-2 number, since 2×21110033331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21110033311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11610771 + ... + 11612588.

It is an arithmetic number, because the mean of its divisors is an integer number (2566181280).

Almost surely, 2^21110033331 is an apocalyptic number.

21110033331 is a deficient number, since it is larger than the sum of its proper divisors (9684142029).

21110033331 is a wasteful number, since it uses less digits than its factorization.

21110033331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23223466 (or 23223463 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

Adding to 21110033331 its reverse (13333001112), we get a palindrome (34443034443).

The spelling of 21110033331 in words is "twenty-one billion, one hundred ten million, thirty-three thousand, three hundred thirty-one".