20211222 has 16 divisors (see below), whose sum is σ = 41283072. Its totient is φ = 6593640.

The previous prime is 20211221. The next prime is 20211241. The reversal of 20211222 is 22211202.

It is a junction number, because it is equal to n+sod(n) for n = 20211198 and 20211207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211221) 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, 35554 + ... + 36117.

It is an arithmetic number, because the mean of its divisors is an integer number (2580192).

Almost surely, 2^20211222 is an apocalyptic number.

20211222 is an abundant number, since it is smaller than the sum of its proper divisors (21071850).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20211222 is a wasteful number, since it uses less digits than its factorization.

20211222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71723.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 20211222 is about 4495.6892686217. The cubic root of 20211222 is about 272.3939918159.

Adding to 20211222 its reverse (22211202), we get a palindrome (42422424).

The spelling of 20211222 in words is "twenty million, two hundred eleven thousand, two hundred twenty-two".