21110240210441 has 4 divisors (see below), whose sum is σ = 21110673192084. Its totient is φ = 21109807228800.

The previous prime is 21110240210431. The next prime is 21110240210443. The reversal of 21110240210441 is 14401204201112.

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 17968824271225 + 3141415939216 = 4238965^2 + 1772404^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21110240210441 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21110240210443) 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, 216417680 + ... + 216515201.

It is an arithmetic number, because the mean of its divisors is an integer number (5277668298021).

Almost surely, 2^{21110240210441} is an apocalyptic number.

It is an amenable number.

21110240210441 is a deficient number, since it is larger than the sum of its proper divisors (432981643).

21110240210441 is an equidigital number, since it uses as much as digits as its factorization.

21110240210441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432981642.

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 21110240210441 its reverse (14401204201112), we get a palindrome (35511444411553).

The spelling of 21110240210441 in words is "twenty-one trillion, one hundred ten billion, two hundred forty million, two hundred ten thousand, four hundred forty-one".