22271918 has 4 divisors (see below), whose sum is σ = 33407880. Its totient is φ = 11135958.

The previous prime is 22271911. The next prime is 22271923. The reversal of 22271918 is 81917222.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22271911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5567978 + ... + 5567981.

It is an arithmetic number, because the mean of its divisors is an integer number (8351970).

Almost surely, 2^22271918 is an apocalyptic number.

22271918 is a deficient number, since it is larger than the sum of its proper divisors (11135962).

22271918 is a wasteful number, since it uses less digits than its factorization.

22271918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11135961.

The product of its digits is 4032, while the sum is 32.

The square root of 22271918 is about 4719.3132975042. The cubic root of 22271918 is about 281.3536409475.

The spelling of 22271918 in words is "twenty-two million, two hundred seventy-one thousand, nine hundred eighteen".