202121212222 has 64 divisors (see below), whose sum is σ = 329213030400. Its totient is φ = 92775352320.

The previous prime is 202121212211. The next prime is 202121212229. The reversal of 202121212222 is 222212121202.

202121212222 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 202121212222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202121212229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48386998 + ... + 48391174.

It is an arithmetic number, because the mean of its divisors is an integer number (5143953600).

Almost surely, 2^202121212222 is an apocalyptic number.

202121212222 is a deficient number, since it is larger than the sum of its proper divisors (127091818178).

202121212222 is a wasteful number, since it uses less digits than its factorization.

202121212222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4561.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 202121212222 its reverse (222212121202), we get a palindrome (424333333424).

The spelling of 202121212222 in words is "two hundred two billion, one hundred twenty-one million, two hundred twelve thousand, two hundred twenty-two".