21112222212222 has 8 divisors (see below), whose sum is σ = 42224444424456. Its totient is φ = 7037407404072.

The previous prime is 21112222212209. The next prime is 21112222212281. The reversal of 21112222212222 is 22221222221112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

21112222212222 is an admirable number.

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

It is a junction number, because it is equal to n+sod(n) for n = 21112222212192 and 21112222212201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1759351851013 + ... + 1759351851024.

It is an arithmetic number, because the mean of its divisors is an integer number (5278055553057).

Almost surely, 2^{21112222212222} is an apocalyptic number.

21112222212222 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21112222212222 is a wasteful number, since it uses less digits than its factorization.

21112222212222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3518703702042.

The product of its digits is 1024, while the sum is 24.

Adding to 21112222212222 its reverse (22221222221112), we get a palindrome (43333444433334).

The spelling of 21112222212222 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty-two million, two hundred twelve thousand, two hundred twenty-two".