21102200222012 has 144 divisors (see below), whose sum is σ = 48708951611040. Its totient is φ = 7906869831168.

The previous prime is 21102200221969. The next prime is 21102200222017. The reversal of 21102200222012 is 21022200220112.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102200222017) 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 47 ways as a sum of consecutive naturals, for example, 212817998 + ... + 212917130.

It is an arithmetic number, because the mean of its divisors is an integer number (338256608410).

Almost surely, 2^{21102200222012} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21102200222012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24354475805520).

21102200222012 is an abundant number, since it is smaller than the sum of its proper divisors (27606751389028).

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

21102200222012 is a wasteful number, since it uses less digits than its factorization.

21102200222012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103580 (or 103571 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21102200222012 its reverse (21022200220112), we get a palindrome (42124400442124).

The spelling of 21102200222012 in words is "twenty-one trillion, one hundred two billion, two hundred million, two hundred twenty-two thousand, twelve".