212212121022 has 96 divisors (see below), whose sum is σ = 520326132480. Its totient is φ = 64061672400.

The previous prime is 212212120993. The next prime is 212212121081. The reversal of 212212121022 is 220121212212.

It is a happy number.

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 = 212212120986 and 212212121004.

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, 1656697 + ... + 1780187.

It is an arithmetic number, because the mean of its divisors is an integer number (5420063880).

Almost surely, 2^212212121022 is an apocalyptic number.

212212121022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 212212121022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260163066240).

212212121022 is an abundant number, since it is smaller than the sum of its proper divisors (308114011458).

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

212212121022 is a wasteful number, since it uses less digits than its factorization.

212212121022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123787 (or 123770 counting only the distinct ones).

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

Adding to 212212121022 its reverse (220121212212), we get a palindrome (432333333234).

The spelling of 212212121022 in words is "two hundred twelve billion, two hundred twelve million, one hundred twenty-one thousand, twenty-two".