21002211222112 has 96 divisors (see below), whose sum is σ = 44515957177440. Its totient is φ = 9717874974720.

The previous prime is 21002211222107. The next prime is 21002211222121. The reversal of 21002211222112 is 21122211220012.

It is a self number, because there is not a number n which added to its sum of digits gives 21002211222112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19185814 + ... + 20250922.

It is an arithmetic number, because the mean of its divisors is an integer number (463707887265).

Almost surely, 2^{21002211222112} 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 21002211222112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22257978588720).

21002211222112 is an abundant number, since it is smaller than the sum of its proper divisors (23513745955328).

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

21002211222112 is a wasteful number, since it uses less digits than its factorization.

21002211222112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065744 (or 1065736 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21002211222112 its reverse (21122211220012), we get a palindrome (42124422442124).

The spelling of 21002211222112 in words is "twenty-one trillion, two billion, two hundred eleven million, two hundred twenty-two thousand, one hundred twelve".