13109021856 has 576 divisors, whose sum is σ = 47516571648. Its totient is φ = 3473445888.

The previous prime is 13109021831. The next prime is 13109021857. The reversal of 13109021856 is 65812090131.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 13109021856.

It is not an unprimeable number, because it can be changed into a prime (13109021857) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 46321491 + ... + 46321773.

It is an arithmetic number, because the mean of its divisors is an integer number (82494048).

Almost surely, 2^13109021856 is an apocalyptic number.

13109021856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13109021856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23758285824).

13109021856 is an abundant number, since it is smaller than the sum of its proper divisors (34407549792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13109021856 is a wasteful number, since it uses less digits than its factorization.

13109021856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375 (or 355 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The spelling of 13109021856 in words is "thirteen billion, one hundred nine million, twenty-one thousand, eight hundred fifty-six".