22109847 has 4 divisors (see below), whose sum is σ = 29479800. Its totient is φ = 14739896.

The previous prime is 22109827. The next prime is 22109891. The reversal of 22109847 is 74890122.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 22109847 - 2¹² = 22105751 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22109827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3684972 + ... + 3684977.

It is an arithmetic number, because the mean of its divisors is an integer number (7369950).

Almost surely, 2^22109847 is an apocalyptic number.

22109847 is a deficient number, since it is larger than the sum of its proper divisors (7369953).

22109847 is an equidigital number, since it uses as much as digits as its factorization.

22109847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7369952.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 22109847 is about 4702.1109089429. The cubic root of 22109847 is about 280.6695160224.

Adding to 22109847 its reverse (74890122), we get a palindrome (96999969).

The spelling of 22109847 in words is "twenty-two million, one hundred nine thousand, eight hundred forty-seven".