21113343522241 has 4 divisors (see below), whose sum is σ = 21117589122132. Its totient is φ = 21109097922352.

The previous prime is 21113343522217. The next prime is 21113343522263. The reversal of 21113343522241 is 14222534331112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7662493870641 + 13450849651600 = 2768121^2 + 3667540^2 .

It is a cyclic number.

It is not a de Polignac number, because 21113343522241 - 2⁵ = 21113343522209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21113343522197 and 21113343522206.

It is not an unprimeable number, because it can be changed into a prime (21113343532241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2122792486 + ... + 2122802431.

It is an arithmetic number, because the mean of its divisors is an integer number (5279397280533).

Almost surely, 2^{21113343522241} is an apocalyptic number.

It is an amenable number.

21113343522241 is a deficient number, since it is larger than the sum of its proper divisors (4245599891).

21113343522241 is an equidigital number, since it uses as much as digits as its factorization.

21113343522241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4245599890.

The product of its digits is 34560, while the sum is 34.

Adding to 21113343522241 its reverse (14222534331112), we get a palindrome (35335877853353).

The spelling of 21113343522241 in words is "twenty-one trillion, one hundred thirteen billion, three hundred forty-three million, five hundred twenty-two thousand, two hundred forty-one".