2111222122212 has 144 divisors (see below), whose sum is σ = 5702745000960. Its totient is φ = 595482328704.

The previous prime is 2111222122193. The next prime is 2111222122223. The reversal of 2111222122212 is 2122212221112.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nude number because it is divisible by every one of its digits.

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, 311432239 + ... + 311439017.

It is an arithmetic number, because the mean of its divisors is an integer number (39602395840).

Almost surely, 2^{2111222122212} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2111222122212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2851372500480).

2111222122212 is an abundant number, since it is smaller than the sum of its proper divisors (3591522878748).

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

2111222122212 is a wasteful number, since it uses less digits than its factorization.

2111222122212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7258 (or 7107 counting only the distinct ones).

The product of its digits is 256, while the sum is 21.

Adding to 2111222122212 its reverse (2122212221112), we get a palindrome (4233434343324).

The spelling of 2111222122212 in words is "two trillion, one hundred eleven billion, two hundred twenty-two million, one hundred twenty-two thousand, two hundred twelve".