22109855 has 4 divisors (see below), whose sum is σ = 26531832. Its totient is φ = 17687880.

The previous prime is 22109827. The next prime is 22109891. The reversal of 22109855 is 55890122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55890122 = 2 ⋅27945061.

It is not a de Polignac number, because 22109855 - 2¹⁴ = 22093471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2210981 + ... + 2210990.

It is an arithmetic number, because the mean of its divisors is an integer number (6632958).

Almost surely, 2^22109855 is an apocalyptic number.

22109855 is a deficient number, since it is larger than the sum of its proper divisors (4421977).

22109855 is an equidigital number, since it uses as much as digits as its factorization.

22109855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4421976.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 22109855 is about 4702.1117596246. Note that the first 3 decimals coincide. The cubic root of 22109855 is about 280.6695498739.

Adding to 22109855 its reverse (55890122), we get a palindrome (77999977).

The spelling of 22109855 in words is "twenty-two million, one hundred nine thousand, eight hundred fifty-five".