21115053241 has 4 divisors (see below), whose sum is σ = 21115653712. Its totient is φ = 21114452772.

The previous prime is 21115053227. The next prime is 21115053277. The reversal of 21115053241 is 14235051112.

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 21115053241 - 2⁵ = 21115053209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21115056241) 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, 243975 + ... + 318988.

It is an arithmetic number, because the mean of its divisors is an integer number (5278913428).

Almost surely, 2^21115053241 is an apocalyptic number.

It is an amenable number.

21115053241 is a deficient number, since it is larger than the sum of its proper divisors (600471).

21115053241 is an equidigital number, since it uses as much as digits as its factorization.

21115053241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600470.

The product of its (nonzero) digits is 1200, while the sum is 25.

The spelling of 21115053241 in words is "twenty-one billion, one hundred fifteen million, fifty-three thousand, two hundred forty-one".