13933721216 has 16 divisors (see below), whose sum is σ = 27758585490. Its totient is φ = 6966860544.

The previous prime is 13933721209. The next prime is 13933721239. The reversal of 13933721216 is 61212733931.

It can be written as a sum of positive squares in only one way, i.e., 10201000000 + 3732721216 = 101000^2 + 61096^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a self number, because there is not a number n which added to its sum of digits gives 13933721216.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54428471 + ... + 54428726.

Almost surely, 2^13933721216 is an apocalyptic number.

13933721216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

13933721216 is a deficient number, since it is larger than the sum of its proper divisors (13824864274).

13933721216 is an equidigital number, since it uses as much as digits as its factorization.

13933721216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108857211 (or 108857199 counting only the distinct ones).

The product of its digits is 40824, while the sum is 38.

The spelling of 13933721216 in words is "thirteen billion, nine hundred thirty-three million, seven hundred twenty-one thousand, two hundred sixteen".