22191118 has 4 divisors (see below), whose sum is σ = 33286680. Its totient is φ = 11095558.

The previous prime is 22191101. The next prime is 22191163. The reversal of 22191118 is 81119122.

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

It is a junction number, because it is equal to n+sod(n) for n = 22191092 and 22191101.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5547778 + ... + 5547781.

It is an arithmetic number, because the mean of its divisors is an integer number (8321670).

Almost surely, 2^22191118 is an apocalyptic number.

22191118 is a deficient number, since it is larger than the sum of its proper divisors (11095562).

22191118 is a wasteful number, since it uses less digits than its factorization.

22191118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11095561.

The product of its digits is 288, while the sum is 25.

The square root of 22191118 is about 4710.7449517035. The cubic root of 22191118 is about 281.0129889345.

It can be divided in two parts, 2219 and 1118, that multiplied together give a palindrome (2480842).

The spelling of 22191118 in words is "twenty-two million, one hundred ninety-one thousand, one hundred eighteen".