212111222130 has 128 divisors (see below), whose sum is σ = 568722954240. Its totient is φ = 56254392000.

The previous prime is 212111222129. The next prime is 212111222137. The reversal of 212111222130 is 31222111212.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (212111222137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 55772809 + ... + 55776611.

It is an arithmetic number, because the mean of its divisors is an integer number (4443148080).

Almost surely, 2^212111222130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212111222130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (284361477120).

212111222130 is an abundant number, since it is smaller than the sum of its proper divisors (356611732110).

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

212111222130 is a wasteful number, since it uses less digits than its factorization.

212111222130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4893 (or 4887 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 212111222130 its reverse (31222111212), we get a palindrome (243333333342).

The spelling of 212111222130 in words is "two hundred twelve billion, one hundred eleven million, two hundred twenty-two thousand, one hundred thirty".