21111122220112 has 40 divisors (see below), whose sum is σ = 42701435627400. Its totient is φ = 10098075520512.

The previous prime is 21111122220103. The next prime is 21111122220137. The reversal of 21111122220112 is 21102222111112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9734424960016 + 11376697260096 = 3120004^2 + 3372936^2 .

It is a super-3 number, since 3×21111122220112³ (a number of 41 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21111122220112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208656343 + ... + 208757494.

It is an arithmetic number, because the mean of its divisors is an integer number (1067535890685).

Almost surely, 2^{21111122220112} is an apocalyptic number.

It is an amenable number.

21111122220112 is an abundant number, since it is smaller than the sum of its proper divisors (21590313407288).

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

21111122220112 is a wasteful number, since it uses less digits than its factorization.

21111122220112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417413983 (or 417413977 counting only the distinct ones).

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

Adding to 21111122220112 its reverse (21102222111112), we get a palindrome (42213344331224).

The spelling of 21111122220112 in words is "twenty-one trillion, one hundred eleven billion, one hundred twenty-two million, two hundred twenty thousand, one hundred twelve".