10001221212222 has 96 divisors (see below), whose sum is σ = 22660466628384. Its totient is φ = 3184729747200.

The previous prime is 10001221212163. The next prime is 10001221212247. The reversal of 10001221212222 is 22221212210001.

It is a happy number.

10001221212222 is a `hidden beast` number, since 10 + 0 + 0 + 1 + 221 + 212 + 222 = 666.

10001221212222 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 10001221212195 and 10001221212204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22407697 + ... + 22849667.

It is an arithmetic number, because the mean of its divisors is an integer number (236046527379).

Almost surely, 2^{10001221212222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 10001221212222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11330233314192).

10001221212222 is an abundant number, since it is smaller than the sum of its proper divisors (12659245416162).

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

10001221212222 is a wasteful number, since it uses less digits than its factorization.

10001221212222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442634 (or 442631 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 10001221212222 its reverse (22221212210001), we get a palindrome (32222433422223).

The spelling of 10001221212222 in words is "ten trillion, one billion, two hundred twenty-one million, two hundred twelve thousand, two hundred twenty-two".