21112111021222 has 64 divisors (see below), whose sum is σ = 35367037413120. Its totient is φ = 9384911093376.

The previous prime is 21112111021213. The next prime is 21112111021237. The reversal of 21112111021222 is 22212011121112.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21112111021222.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 687518793 + ... + 687549499.

It is an arithmetic number, because the mean of its divisors is an integer number (552609959580).

Almost surely, 2^{21112111021222} is an apocalyptic number.

21112111021222 is a deficient number, since it is larger than the sum of its proper divisors (14254926391898).

21112111021222 is a wasteful number, since it uses less digits than its factorization.

21112111021222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32965.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21112111021222 its reverse (22212011121112), we get a palindrome (43324122142334).

The spelling of 21112111021222 in words is "twenty-one trillion, one hundred twelve billion, one hundred eleven million, twenty-one thousand, two hundred twenty-two".