21313121222105 has 8 divisors (see below), whose sum is σ = 27080201082312. Its totient is φ = 16047526567168.

The previous prime is 21313121222083. The next prime is 21313121222111. The reversal of 21313121222105 is 50122212131312.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9525963725056 + 11787157497049 = 3086416^2 + 3433243^2 .

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 21313121222105 - 2¹⁰ = 21313121221081 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125371301222 + ... + 125371301391.

It is an arithmetic number, because the mean of its divisors is an integer number (3385025135289).

Almost surely, 2^{21313121222105} is an apocalyptic number.

It is an amenable number.

21313121222105 is a deficient number, since it is larger than the sum of its proper divisors (5767079860207).

21313121222105 is a wasteful number, since it uses less digits than its factorization.

21313121222105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250742602635.

The product of its (nonzero) digits is 1440, while the sum is 26.

Adding to 21313121222105 its reverse (50122212131312), we get a palindrome (71435333353417).

The spelling of 21313121222105 in words is "twenty-one trillion, three hundred thirteen billion, one hundred twenty-one million, two hundred twenty-two thousand, one hundred five".