21112121022222 has 32 divisors (see below), whose sum is σ = 44076212755200. Its totient is φ = 6728935973760.

The previous prime is 21112121022221. The next prime is 21112121022227. The reversal of 21112121022222 is 22222012121112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112121022221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27632347 + ... + 28386102.

It is an arithmetic number, because the mean of its divisors is an integer number (1377381648600).

Almost surely, 2^{21112121022222} is an apocalyptic number.

21112121022222 is an abundant number, since it is smaller than the sum of its proper divisors (22964091732978).

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

21112121022222 is a wasteful number, since it uses less digits than its factorization.

21112121022222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56021208.

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

Adding to 21112121022222 its reverse (22222012121112), we get a palindrome (43334133143334).

The spelling of 21112121022222 in words is "twenty-one trillion, one hundred twelve billion, one hundred twenty-one million, twenty-two thousand, two hundred twenty-two".