212212021212 has 144 divisors (see below), whose sum is σ = 583753730560. Its totient is φ = 64780176384.

The previous prime is 212212021159. The next prime is 212212021261. The reversal of 212212021212 is 212120212212.

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 an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2815773 + ... + 2890155.

Almost surely, 2^212212021212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212212021212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (291876865280).

212212021212 is an abundant number, since it is smaller than the sum of its proper divisors (371541709348).

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

212212021212 is a wasteful number, since it uses less digits than its factorization.

212212021212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74552 (or 74547 counting only the distinct ones).

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

Adding to 212212021212 its reverse (212120212212), we get a palindrome (424332233424).

The spelling of 212212021212 in words is "two hundred twelve billion, two hundred twelve million, twenty-one thousand, two hundred twelve".