21801119 has 4 divisors (see below), whose sum is σ = 21815496. Its totient is φ = 21786744.

The previous prime is 21801097. The next prime is 21801121. The reversal of 21801119 is 91110812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21801119 - 2¹² = 21797023 is a prime.

It is a super-2 number, since 2×21801119² = 950577579304322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21801094 and 21801103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21801019) 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 3 ways as a sum of consecutive naturals, for example, 4604 + ... + 8049.

It is an arithmetic number, because the mean of its divisors is an integer number (5453874).

Almost surely, 2^21801119 is an apocalyptic number.

21801119 is a deficient number, since it is larger than the sum of its proper divisors (14377).

21801119 is a wasteful number, since it uses less digits than its factorization.

21801119 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14376.

The product of its (nonzero) digits is 144, while the sum is 23.

The square root of 21801119 is about 4669.1668421679. The cubic root of 21801119 is about 279.3570237855.

The spelling of 21801119 in words is "twenty-one million, eight hundred one thousand, one hundred nineteen".