21111122202112 has 80 divisors (see below), whose sum is σ = 44569895736960. Its totient is φ = 9961981212672.

The previous prime is 21111122202109. The next prime is 21111122202167. The reversal of 21111122202112 is 21120222111112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 21111122202112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1567278 + ... + 6684205.

It is an arithmetic number, because the mean of its divisors is an integer number (557123696712).

Almost surely, 2^{21111122202112} is an apocalyptic number.

It is an amenable number.

21111122202112 is an abundant number, since it is smaller than the sum of its proper divisors (23458773534848).

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

21111122202112 is an equidigital number, since it uses as much as digits as its factorization.

21111122202112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8251783 (or 8251767 counting only the distinct ones).

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

Adding to 21111122202112 its reverse (21120222111112), we get a palindrome (42231344313224).

The spelling of 21111122202112 in words is "twenty-one trillion, one hundred eleven billion, one hundred twenty-two million, two hundred two thousand, one hundred twelve".