21311011033 has 12 divisors (see below), whose sum is σ = 23081163408. Its totient is φ = 19667659440.

The previous prime is 21311011003. The next prime is 21311011069. The reversal of 21311011033 is 33011011312.

It is not a de Polignac number, because 21311011033 - 2⁹ = 21311010521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21311010998 and 21311011016.

It is not an unprimeable number, because it can be changed into a prime (21311011003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1087266 + ... + 1106692.

It is an arithmetic number, because the mean of its divisors is an integer number (1923430284).

Almost surely, 2^21311011033 is an apocalyptic number.

It is an amenable number.

21311011033 is a deficient number, since it is larger than the sum of its proper divisors (1770152375).

21311011033 is a wasteful number, since it uses less digits than its factorization.

21311011033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25944 (or 25931 counting only the distinct ones).

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

Adding to 21311011033 its reverse (33011011312), we get a palindrome (54322022345).

The spelling of 21311011033 in words is "twenty-one billion, three hundred eleven million, eleven thousand, thirty-three".