21131110241 has 4 divisors (see below), whose sum is σ = 21428731584. Its totient is φ = 20833488900.

The previous prime is 21131110207. The next prime is 21131110271. The reversal of 21131110241 is 14201113112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21131110241 - 2¹⁸ = 21130848097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21131110271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148810565 + ... + 148810706.

It is an arithmetic number, because the mean of its divisors is an integer number (5357182896).

Almost surely, 2^21131110241 is an apocalyptic number.

It is an amenable number.

21131110241 is a deficient number, since it is larger than the sum of its proper divisors (297621343).

21131110241 is an equidigital number, since it uses as much as digits as its factorization.

21131110241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297621342.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 21131110241 its reverse (14201113112), we get a palindrome (35332223353).

The spelling of 21131110241 in words is "twenty-one billion, one hundred thirty-one million, one hundred ten thousand, two hundred forty-one".