13821071 has 8 divisors (see below), whose sum is σ = 15564288. Its totient is φ = 12159000.

The previous prime is 13821061. The next prime is 13821079. The reversal of 13821071 is 17012831.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 13821071 - 2⁶ = 13821007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13821079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19925 + ... + 20606.

It is an arithmetic number, because the mean of its divisors is an integer number (1945536).

Almost surely, 2^13821071 is an apocalyptic number.

13821071 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13821071 is a deficient number, since it is larger than the sum of its proper divisors (1743217).

13821071 is a wasteful number, since it uses less digits than its factorization.

13821071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40573.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 13821071 is about 3717.6701037074. The cubic root of 13821071 is about 239.9830485713.

The spelling of 13821071 in words is "thirteen million, eight hundred twenty-one thousand, seventy-one".