22173221 has 8 divisors (see below), whose sum is σ = 25369344. Its totient is φ = 18984240.

The previous prime is 22173211. The next prime is 22173223. The reversal of 22173221 is 12237122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22173221 - 2⁶ = 22173157 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 22173193 and 22173202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22173223) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 10916 + ... + 12786.

It is an arithmetic number, because the mean of its divisors is an integer number (3171168).

Almost surely, 2^22173221 is an apocalyptic number.

It is an amenable number.

22173221 is a deficient number, since it is larger than the sum of its proper divisors (3196123).

22173221 is a wasteful number, since it uses less digits than its factorization.

22173221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3571.

The product of its digits is 336, while the sum is 20.

The square root of 22173221 is about 4708.8449751505. The cubic root of 22173221 is about 280.9374235349.

The spelling of 22173221 in words is "twenty-two million, one hundred seventy-three thousand, two hundred twenty-one".