21115503316241 has 8 divisors (see below), whose sum is σ = 21123919724544. Its totient is φ = 21107088417600.

The previous prime is 21115503316223. The next prime is 21115503316291. The reversal of 21115503316241 is 14261330551112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21115503316241 - 2¹⁸ = 21115503054097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21115503316291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28026416 + ... + 28769966.

It is an arithmetic number, because the mean of its divisors is an integer number (2640489965568).

Almost surely, 2^{21115503316241} is an apocalyptic number.

It is an amenable number.

21115503316241 is a deficient number, since it is larger than the sum of its proper divisors (8416408303).

21115503316241 is an equidigital number, since it uses as much as digits as its factorization.

21115503316241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754831.

The product of its (nonzero) digits is 21600, while the sum is 35.

Adding to 21115503316241 its reverse (14261330551112), we get a palindrome (35376833867353).

The spelling of 21115503316241 in words is "twenty-one trillion, one hundred fifteen billion, five hundred three million, three hundred sixteen thousand, two hundred forty-one".