21311103033 has 24 divisors (see below), whose sum is σ = 33699837600. Its totient is φ = 12870164160.

The previous prime is 21311102987. The next prime is 21311103053. The reversal of 21311103033 is 33030111312.

It is a happy number.

It is not a de Polignac number, because 21311103033 - 2⁹ = 21311102521 is a prime.

It is a super-2 number, since 2×21311103033² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21311102997 and 21311103015.

It is not an unprimeable number, because it can be changed into a prime (21311103053) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 352308 + ... + 408341.

It is an arithmetic number, because the mean of its divisors is an integer number (1404159900).

Almost surely, 2^21311103033 is an apocalyptic number.

It is an amenable number.

21311103033 is a deficient number, since it is larger than the sum of its proper divisors (12388734567).

21311103033 is a wasteful number, since it uses less digits than its factorization.

21311103033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760949 (or 760946 counting only the distinct ones).

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

Adding to 21311103033 its reverse (33030111312), we get a palindrome (54341214345).

The spelling of 21311103033 in words is "twenty-one billion, three hundred eleven million, one hundred three thousand, thirty-three".