202221121212 has 216 divisors, whose sum is σ = 586454319360. Its totient is φ = 60496619040.

The previous prime is 202221121189. The next prime is 202221121213. The reversal of 202221121212 is 212121122202.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202221121213) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 22801603 + ... + 22810469.

Almost surely, 2^202221121212 is an apocalyptic number.

202221121212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 202221121212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (293227159680).

202221121212 is an abundant number, since it is smaller than the sum of its proper divisors (384233198148).

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

202221121212 is an equidigital number, since it uses as much as digits as its factorization.

202221121212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8985 (or 8962 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 202221121212 its reverse (212121122202), we get a palindrome (414342243414).

The spelling of 202221121212 in words is "two hundred two billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred twelve".