21631323341 has 4 divisors (see below), whose sum is σ = 21997956000. Its totient is φ = 21264690684.

The previous prime is 21631323293. The next prime is 21631323349. The reversal of 21631323341 is 14332313612.

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 21631323341 - 2¹⁸ = 21631061197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21631323349) 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, 183316241 + ... + 183316358.

It is an arithmetic number, because the mean of its divisors is an integer number (5499489000).

Almost surely, 2^21631323341 is an apocalyptic number.

It is an amenable number.

21631323341 is a deficient number, since it is larger than the sum of its proper divisors (366632659).

21631323341 is an equidigital number, since it uses as much as digits as its factorization.

21631323341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366632658.

The product of its digits is 7776, while the sum is 29.

Adding to 21631323341 its reverse (14332313612), we get a palindrome (35963636953).

The spelling of 21631323341 in words is "twenty-one billion, six hundred thirty-one million, three hundred twenty-three thousand, three hundred forty-one".