13021085840 has 80 divisors (see below), whose sum is σ = 35791994880. Its totient is φ = 4310423040.

The previous prime is 13021085801. The next prime is 13021085851. The reversal of 13021085840 is 4858012031.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 13021085797 and 13021085806.

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, 384656 + ... + 417135.

It is an arithmetic number, because the mean of its divisors is an integer number (447399936).

Almost surely, 2^13021085840 is an apocalyptic number.

13021085840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13021085840 is an abundant number, since it is smaller than the sum of its proper divisors (22770909040).

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

13021085840 is a wasteful number, since it uses less digits than its factorization.

13021085840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801840 (or 801834 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 32.

Adding to 13021085840 its reverse (4858012031), we get a palindrome (17879097871).

The spelling of 13021085840 in words is "thirteen billion, twenty-one million, eighty-five thousand, eight hundred forty".