21133321241 has 4 divisors (see below), whose sum is σ = 21624793872. Its totient is φ = 20641848612.

The previous prime is 21133321211. The next prime is 21133321247. The reversal of 21133321241 is 14212333112.

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 a de Polignac number, because none of the positive numbers 2^k-21133321241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21133321247) 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, 245736251 + ... + 245736336.

It is an arithmetic number, because the mean of its divisors is an integer number (5406198468).

Almost surely, 2^21133321241 is an apocalyptic number.

It is an amenable number.

21133321241 is a deficient number, since it is larger than the sum of its proper divisors (491472631).

21133321241 is an equidigital number, since it uses as much as digits as its factorization.

21133321241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491472630.

The product of its digits is 864, while the sum is 23.

Adding to 21133321241 its reverse (14212333112), we get a palindrome (35345654353).

The spelling of 21133321241 in words is "twenty-one billion, one hundred thirty-three million, three hundred twenty-one thousand, two hundred forty-one".