212221120122 has 64 divisors (see below), whose sum is σ = 541553126400. Its totient is φ = 60924720240.

The previous prime is 212221120091. The next prime is 212221120301. The reversal of 212221120122 is 221021122212.

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 = 212221120095 and 212221120104.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9390678 + ... + 9413249.

It is an arithmetic number, because the mean of its divisors is an integer number (8461767600).

Almost surely, 2^212221120122 is an apocalyptic number.

212221120122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

212221120122 is an abundant number, since it is smaller than the sum of its proper divisors (329332006278).

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

212221120122 is a wasteful number, since it uses less digits than its factorization.

212221120122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18803968 (or 18803962 counting only the distinct ones).

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

Adding to 212221120122 its reverse (221021122212), we get a palindrome (433242242334).

The spelling of 212221120122 in words is "two hundred twelve billion, two hundred twenty-one million, one hundred twenty thousand, one hundred twenty-two".