20221212222 has 32 divisors (see below), whose sum is σ = 45380950560. Its totient is φ = 6673665600.

The previous prime is 20221212199. The next prime is 20221212227. The reversal of 20221212222 is 22221212202.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20221212195 and 20221212204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20221212227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1848343 + ... + 1859250.

It is an arithmetic number, because the mean of its divisors is an integer number (1418154705).

Almost surely, 2^20221212222 is an apocalyptic number.

20221212222 is an abundant number, since it is smaller than the sum of its proper divisors (25159738338).

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

20221212222 is a wasteful number, since it uses less digits than its factorization.

20221212222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3707705 (or 3707699 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 20221212222 its reverse (22221212202), we get a palindrome (42442424424).

The spelling of 20221212222 in words is "twenty billion, two hundred twenty-one million, two hundred twelve thousand, two hundred twenty-two".