21112003310021 has 6 divisors (see below), whose sum is σ = 22860926661330. Its totient is φ = 19488003055248.

The previous prime is 21112003309981. The next prime is 21112003310051. The reversal of 21112003310021 is 12001330021112.

It can be written as a sum of positive squares in 3 ways, for example, as 5099959396 + 21106903350625 = 71414^2 + 4594225^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21112003310021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112003310051) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 62461548086 + ... + 62461548423.

It is an arithmetic number, because the mean of its divisors is an integer number (3810154443555).

Almost surely, 2^{21112003310021} is an apocalyptic number.

It is an amenable number.

21112003310021 is a deficient number, since it is larger than the sum of its proper divisors (1748923351309).

21112003310021 is a wasteful number, since it uses less digits than its factorization.

21112003310021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124923096535 (or 124923096522 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21112003310021 its reverse (12001330021112), we get a palindrome (33113333331133).

The spelling of 21112003310021 in words is "twenty-one trillion, one hundred twelve billion, three million, three hundred ten thousand, twenty-one".