212122121172 has 24 divisors (see below), whose sum is σ = 533024817696. Its totient is φ = 65268344928.

The previous prime is 212122121171. The next prime is 212122121207. The reversal of 212122121172 is 271121221212.

212122121172 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212122121171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 679878438 + ... + 679878749.

It is an arithmetic number, because the mean of its divisors is an integer number (22209367404).

Almost surely, 2^212122121172 is an apocalyptic number.

It is an amenable number.

212122121172 is an abundant number, since it is smaller than the sum of its proper divisors (320902696524).

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

212122121172 is a wasteful number, since it uses less digits than its factorization.

212122121172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1359757207 (or 1359757205 counting only the distinct ones).

The product of its digits is 448, while the sum is 24.

Adding to 212122121172 its reverse (271121221212), we get a palindrome (483243342384).

The spelling of 212122121172 in words is "two hundred twelve billion, one hundred twenty-two million, one hundred twenty-one thousand, one hundred seventy-two".