22742171 has 4 divisors (see below), whose sum is σ = 22786344. Its totient is φ = 22698000.

The previous prime is 22742149. The next prime is 22742191. The reversal of 22742171 is 17124722.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17124722 = 2 ⋅8562361.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22742171 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22742171.

It is not an unprimeable number, because it can be changed into a prime (22742131) 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, 21305 + ... + 22346.

It is an arithmetic number, because the mean of its divisors is an integer number (5696586).

Almost surely, 2^22742171 is an apocalyptic number.

22742171 is a deficient number, since it is larger than the sum of its proper divisors (44173).

22742171 is an equidigital number, since it uses as much as digits as its factorization.

22742171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44172.

The product of its digits is 1568, while the sum is 26.

The square root of 22742171 is about 4768.8752342665. The cubic root of 22742171 is about 283.3200481276.

Adding to 22742171 its reverse (17124722), we get a palindrome (39866893).

The spelling of 22742171 in words is "twenty-two million, seven hundred forty-two thousand, one hundred seventy-one".