21916119 has 4 divisors (see below), whose sum is σ = 29221496. Its totient is φ = 14610744.

The previous prime is 21916117. The next prime is 21916127. The reversal of 21916119 is 91161912.

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

It is not a de Polignac number, because 21916119 - 2¹ = 21916117 is a prime.

It is a super-3 number, since 3×21916119³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21916117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3652684 + ... + 3652689.

It is an arithmetic number, because the mean of its divisors is an integer number (7305374).

Almost surely, 2^21916119 is an apocalyptic number.

21916119 is a deficient number, since it is larger than the sum of its proper divisors (7305377).

21916119 is an equidigital number, since it uses as much as digits as its factorization.

21916119 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7305376.

The product of its digits is 972, while the sum is 30.

The square root of 21916119 is about 4681.4654756817. The cubic root of 21916119 is about 279.8473615341.

The spelling of 21916119 in words is "twenty-one million, nine hundred sixteen thousand, one hundred nineteen".