21119791 has 8 divisors (see below), whose sum is σ = 26331264. Its totient is φ = 16456920.

The previous prime is 21119771. The next prime is 21119803. The reversal of 21119791 is 19791112.

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 21119791 - 2⁵ = 21119759 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 (21119701) 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 7 ways as a sum of consecutive naturals, for example, 137065 + ... + 137218.

It is an arithmetic number, because the mean of its divisors is an integer number (3291408).

Almost surely, 2^21119791 is an apocalyptic number.

21119791 is a deficient number, since it is larger than the sum of its proper divisors (5211473).

21119791 is a wasteful number, since it uses less digits than its factorization.

21119791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274301.

The product of its digits is 1134, while the sum is 31.

The square root of 21119791 is about 4595.6273782804. The cubic root of 21119791 is about 276.4160174055.

It can be divided in two parts, 211 and 19791, that added together give a palindrome (20002).

The spelling of 21119791 in words is "twenty-one million, one hundred nineteen thousand, seven hundred ninety-one".