13851021 has 8 divisors (see below), whose sum is σ = 18485280. Its totient is φ = 9225392.

The previous prime is 13850999. The next prime is 13851029. The reversal of 13851021 is 12015831.

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 13851021 - 2¹⁵ = 13818253 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13851029) 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, 4771 + ... + 7103.

It is an arithmetic number, because the mean of its divisors is an integer number (2310660).

Almost surely, 2^13851021 is an apocalyptic number.

It is an amenable number.

13851021 is a deficient number, since it is larger than the sum of its proper divisors (4634259).

13851021 is a wasteful number, since it uses less digits than its factorization.

13851021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4315.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 13851021 is about 3721.6959843598. The cubic root of 13851021 is about 240.1562697547.

Adding to 13851021 its reverse (12015831), we get a palindrome (25866852).

The spelling of 13851021 in words is "thirteen million, eight hundred fifty-one thousand, twenty-one".