21633225017 has 4 divisors (see below), whose sum is σ = 21703691856. Its totient is φ = 21562758180.

The previous prime is 21633224993. The next prime is 21633225049. The reversal of 21633225017 is 71052233612.

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 21633225017 - 2¹⁰ = 21633223993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21633225217) 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, 35232959 + ... + 35233572.

It is an arithmetic number, because the mean of its divisors is an integer number (5425922964).

Almost surely, 2^21633225017 is an apocalyptic number.

It is an amenable number.

21633225017 is a deficient number, since it is larger than the sum of its proper divisors (70466839).

21633225017 is an equidigital number, since it uses as much as digits as its factorization.

21633225017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70466838.

The product of its (nonzero) digits is 15120, while the sum is 32.

Adding to 21633225017 its reverse (71052233612), we get a palindrome (92685458629).

The spelling of 21633225017 in words is "twenty-one billion, six hundred thirty-three million, two hundred twenty-five thousand, seventeen".