13208921788 has 12 divisors (see below), whose sum is σ = 23394115080. Its totient is φ = 6524888912.

The previous prime is 13208921701. The next prime is 13208921813. The reversal of 13208921788 is 88712980231.

It is a super-2 number, since 2×13208921788² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19892623 + ... + 19893286.

It is an arithmetic number, because the mean of its divisors is an integer number (1949509590).

Almost surely, 2^13208921788 is an apocalyptic number.

It is an amenable number.

13208921788 is a deficient number, since it is larger than the sum of its proper divisors (10185193292).

13208921788 is a wasteful number, since it uses less digits than its factorization.

13208921788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39785996 (or 39785994 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 49.

The spelling of 13208921788 in words is "thirteen billion, two hundred eight million, nine hundred twenty-one thousand, seven hundred eighty-eight".