22118823 has 6 divisors (see below), whose sum is σ = 31949424. Its totient is φ = 14745876.

The previous prime is 22118809. The next prime is 22118839. The reversal of 22118823 is 32881122.

It is not a de Polignac number, because 22118823 - 2⁴ = 22118807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22118023) 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 5 ways as a sum of consecutive naturals, for example, 1228815 + ... + 1228832.

It is an arithmetic number, because the mean of its divisors is an integer number (5324904).

Almost surely, 2^22118823 is an apocalyptic number.

22118823 is a deficient number, since it is larger than the sum of its proper divisors (9830601).

22118823 is a wasteful number, since it uses less digits than its factorization.

22118823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2457653 (or 2457650 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 22118823 is about 4703.0652770294. The cubic root of 22118823 is about 280.7074922950.

Adding to 22118823 its reverse (32881122), we get a palindrome (54999945).

It can be divided in two parts, 221 and 18823, that added together give a square (19044 = 138²).

The spelling of 22118823 in words is "twenty-two million, one hundred eighteen thousand, eight hundred twenty-three".