212120220122 has 4 divisors (see below), whose sum is σ = 318180330186. Its totient is φ = 106060110060.

The previous prime is 212120220113. The next prime is 212120220127. The reversal of 212120220122 is 221022021212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 210817804201 + 1302415921 = 459149^2 + 36089^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 212120220122.

It is not an unprimeable number, because it can be changed into a prime (212120220127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53030055029 + ... + 53030055032.

Almost surely, 2^212120220122 is an apocalyptic number.

212120220122 is a deficient number, since it is larger than the sum of its proper divisors (106060110064).

212120220122 is a wasteful number, since it uses less digits than its factorization.

212120220122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106060110063.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 212120220122 its reverse (221022021212), we get a palindrome (433142241334).

The spelling of 212120220122 in words is "two hundred twelve billion, one hundred twenty million, two hundred twenty thousand, one hundred twenty-two".