13822021 has 4 divisors (see below), whose sum is σ = 13921600. Its totient is φ = 13722444.

The previous prime is 13822007. The next prime is 13822031. The reversal of 13822021 is 12022831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12022831 = 167 ⋅71993.

It is a cyclic number.

It is not a de Polignac number, because 13822021 - 2¹³ = 13813829 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13822021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13822031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49581 + ... + 49858.

It is an arithmetic number, because the mean of its divisors is an integer number (3480400).

Almost surely, 2^13822021 is an apocalyptic number.

It is an amenable number.

13822021 is a deficient number, since it is larger than the sum of its proper divisors (99579).

13822021 is an equidigital number, since it uses as much as digits as its factorization.

13822021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99578.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 13822021 is about 3717.7978697073. The cubic root of 13822021 is about 239.9885469072.

Adding to 13822021 its reverse (12022831), we get a palindrome (25844852).

It can be divided in two parts, 1382 and 2021, that added together give a triangular number (3403 = T₈₂).

The spelling of 13822021 in words is "thirteen million, eight hundred twenty-two thousand, twenty-one".