13949215921 has 16 divisors (see below), whose sum is σ = 15553287360. Its totient is φ = 12432752640.

The previous prime is 13949215919. The next prime is 13949215933. The reversal of 13949215921 is 12951294931.

13949215921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 13949215921 - 2¹ = 13949215919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13949215961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 983601 + ... + 997681.

It is an arithmetic number, because the mean of its divisors is an integer number (972080460).

Almost surely, 2^13949215921 is an apocalyptic number.

It is an amenable number.

13949215921 is a deficient number, since it is larger than the sum of its proper divisors (1604071439).

13949215921 is a wasteful number, since it uses less digits than its factorization.

13949215921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17184.

The product of its digits is 174960, while the sum is 46.

The spelling of 13949215921 in words is "thirteen billion, nine hundred forty-nine million, two hundred fifteen thousand, nine hundred twenty-one".