22105221 has 8 divisors (see below), whose sum is σ = 30490080. Its totient is φ = 14228592.

The previous prime is 22105217. The next prime is 22105229. The reversal of 22105221 is 12250122.

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

It is not a de Polignac number, because 22105221 - 2² = 22105217 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 22105221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22105229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126955 + ... + 127128.

It is an arithmetic number, because the mean of its divisors is an integer number (3811260).

Almost surely, 2^22105221 is an apocalyptic number.

It is an amenable number.

22105221 is a deficient number, since it is larger than the sum of its proper divisors (8384859).

22105221 is a wasteful number, since it uses less digits than its factorization.

22105221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254115.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 22105221 is about 4701.6189764803. The cubic root of 22105221 is about 280.6499400126.

Adding to 22105221 its reverse (12250122), we get a palindrome (34355343).

The spelling of 22105221 in words is "twenty-two million, one hundred five thousand, two hundred twenty-one".