22022221 has 12 divisors (see below), whose sum is σ = 23980320. Its totient is φ = 20214480.

The previous prime is 22022219. The next prime is 22022227. The reversal of 22022221 is 12222022.

It is not a de Polignac number, because 22022221 - 2¹ = 22022219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22022227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52350 + ... + 52768.

It is an arithmetic number, because the mean of its divisors is an integer number (1998360).

Almost surely, 2^22022221 is an apocalyptic number.

It is an amenable number.

22022221 is a deficient number, since it is larger than the sum of its proper divisors (1958099).

22022221 is a wasteful number, since it uses less digits than its factorization.

22022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 756 (or 743 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 22022221 is about 4692.7839285439. The cubic root of 22022221 is about 280.2982408906.

Adding to 22022221 its reverse (12222022), we get a palindrome (34244243).

The spelling of 22022221 in words is "twenty-two million, twenty-two thousand, two hundred twenty-one".