13021555105 has 16 divisors (see below), whose sum is σ = 17238294864. Its totient is φ = 9381381120.

The previous prime is 13021555097. The next prime is 13021555111. The reversal of 13021555105 is 50155512031.

It can be written as a sum of positive squares in 8 ways, for example, as 1215428769 + 11806126336 = 34863^2 + 108656^2 .

It is not a de Polignac number, because 13021555105 - 2³ = 13021555097 is a prime.

It is a super-2 number, since 2×13021555105² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2440404 + ... + 2445733.

It is an arithmetic number, because the mean of its divisors is an integer number (1077393429).

Almost surely, 2^13021555105 is an apocalyptic number.

It is an amenable number.

13021555105 is a deficient number, since it is larger than the sum of its proper divisors (4216739759).

13021555105 is a wasteful number, since it uses less digits than its factorization.

13021555105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4886196.

The product of its (nonzero) digits is 3750, while the sum is 28.

The spelling of 13021555105 in words is "thirteen billion, twenty-one million, five hundred fifty-five thousand, one hundred five".