21331103110212 has 96 divisors (see below), whose sum is σ = 58479757443072. Its totient is φ = 5923848663936.

The previous prime is 21331103110193. The next prime is 21331103110231. The reversal of 21331103110212 is 21201130113312.

It is an interprime number because it is at equal distance from previous prime (21331103110193) and next prime (21331103110231).

It is a Harshad number since it is a multiple of its sum of digits (21).

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 31 ways as a sum of consecutive naturals, for example, 435828 + ... + 6546155.

It is an arithmetic number, because the mean of its divisors is an integer number (609164140032).

Almost surely, 2^{21331103110212} 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 21331103110212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29239878721536).

21331103110212 is an abundant number, since it is smaller than the sum of its proper divisors (37148654332860).

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

21331103110212 is a wasteful number, since it uses less digits than its factorization.

21331103110212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6983017 (or 6983015 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 21331103110212 its reverse (21201130113312), we get a palindrome (42532233223524).

The spelling of 21331103110212 in words is "twenty-one trillion, three hundred thirty-one billion, one hundred three million, one hundred ten thousand, two hundred twelve".