212121022212 has 60 divisors (see below), whose sum is σ = 604937740176. Its totient is φ = 64279096560.

The previous prime is 212121022199. The next prime is 212121022273. The reversal of 212121022212 is 212220121212.

It is a happy number.

212121022212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×212121022212³ (a number of 35 digits) contains 333 as substring.

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

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 29755278 + ... + 29762405.

Almost surely, 2^212121022212 is an apocalyptic number.

212121022212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

212121022212 is an abundant number, since it is smaller than the sum of its proper divisors (392816717964).

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

212121022212 is a wasteful number, since it uses less digits than its factorization.

212121022212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59517710 (or 59517699 counting only the distinct ones).

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

Adding to 212121022212 its reverse (212220121212), we get a palindrome (424341143424).

The spelling of 212121022212 in words is "two hundred twelve billion, one hundred twenty-one million, twenty-two thousand, two hundred twelve".