13909078221 has 16 divisors (see below), whose sum is σ = 19061985600. Its totient is φ = 9014848128.

The previous prime is 13909078217. The next prime is 13909078273. The reversal of 13909078221 is 12287090931.

It is not a de Polignac number, because 13909078221 - 2² = 13909078217 is a prime.

It is a super-3 number, since 3×13909078221³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13909078321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89985 + ... + 189513.

It is an arithmetic number, because the mean of its divisors is an integer number (1191374100).

Almost surely, 2^13909078221 is an apocalyptic number.

It is an amenable number.

13909078221 is a deficient number, since it is larger than the sum of its proper divisors (5152907379).

13909078221 is a wasteful number, since it uses less digits than its factorization.

13909078221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100828.

The product of its (nonzero) digits is 54432, while the sum is 42.

The spelling of 13909078221 in words is "thirteen billion, nine hundred nine million, seventy-eight thousand, two hundred twenty-one".