20011102222221 has 36 divisors (see below), whose sum is σ = 32370992523324. Its totient is φ = 11899111635840.

The previous prime is 20011102222217. The next prime is 20011102222249. The reversal of 20011102222221 is 12222220111002.

It is a happy number.

20011102222221 is a `hidden beast` number, since 200 + 11 + 10 + 2 + 222 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8287230350025 + 11723871872196 = 2878755^2 + 3424014^2 .

It is not a de Polignac number, because 20011102222221 - 2² = 20011102222217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20011102222194 and 20011102222203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011102222121) 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 35 ways as a sum of consecutive naturals, for example, 173297640 + ... + 173413073.

It is an arithmetic number, because the mean of its divisors is an integer number (899194236759).

Almost surely, 2^{20011102222221} is an apocalyptic number.

It is an amenable number.

20011102222221 is a deficient number, since it is larger than the sum of its proper divisors (12359890301103).

20011102222221 is a wasteful number, since it uses less digits than its factorization.

20011102222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346710794 (or 346710780 counting only the distinct ones).

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

Adding to 20011102222221 its reverse (12222220111002), we get a palindrome (32233322333223).

The spelling of 20011102222221 in words is "twenty trillion, eleven billion, one hundred two million, two hundred twenty-two thousand, two hundred twenty-one".