21830111 has 8 divisors (see below), whose sum is σ = 22943184. Its totient is φ = 20744640.

The previous prime is 21830099. The next prime is 21830119. The reversal of 21830111 is 11103812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21830111 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 21830111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21830119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5270 + ... + 8451.

It is an arithmetic number, because the mean of its divisors is an integer number (2867898).

Almost surely, 2^21830111 is an apocalyptic number.

21830111 is a deficient number, since it is larger than the sum of its proper divisors (1113073).

21830111 is a wasteful number, since it uses less digits than its factorization.

21830111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13801.

The product of its (nonzero) digits is 48, while the sum is 17.

The square root of 21830111 is about 4672.2704330978. The cubic root of 21830111 is about 279.4808023143.

Adding to 21830111 its reverse (11103812), we get a palindrome (32933923).

The spelling of 21830111 in words is "twenty-one million, eight hundred thirty thousand, one hundred eleven".