21313105255 has 8 divisors (see below), whose sum is σ = 27543089952. Its totient is φ = 15738908448.

The previous prime is 21313105243. The next prime is 21313105259. The reversal of 21313105255 is 55250131312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21313105255 is a prime.

It is a super-2 number, since 2×21313105255² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21313105259) 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, 163946899 + ... + 163947028.

It is an arithmetic number, because the mean of its divisors is an integer number (3442886244).

Almost surely, 2^21313105255 is an apocalyptic number.

21313105255 is a deficient number, since it is larger than the sum of its proper divisors (6229984697).

21313105255 is a wasteful number, since it uses less digits than its factorization.

21313105255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327893945.

The product of its (nonzero) digits is 4500, while the sum is 28.

Adding to 21313105255 its reverse (55250131312), we get a palindrome (76563236567).

The spelling of 21313105255 in words is "twenty-one billion, three hundred thirteen million, one hundred five thousand, two hundred fifty-five".