13891221669 has 8 divisors (see below), whose sum is σ = 19946369632. Its totient is φ = 8548444080.

The previous prime is 13891221649. The next prime is 13891221739. The reversal of 13891221669 is 96612219831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13891221669 - 2⁵ = 13891221637 is a prime.

It is a super-2 number, since 2×13891221669² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13891221649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178092547 + ... + 178092624.

It is an arithmetic number, because the mean of its divisors is an integer number (2493296204).

Almost surely, 2^13891221669 is an apocalyptic number.

It is an amenable number.

13891221669 is a deficient number, since it is larger than the sum of its proper divisors (6055147963).

13891221669 is a wasteful number, since it uses less digits than its factorization.

13891221669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356185187.

The product of its digits is 279936, while the sum is 48.

The spelling of 13891221669 in words is "thirteen billion, eight hundred ninety-one million, two hundred twenty-one thousand, six hundred sixty-nine".