21010201122222 has 72 divisors (see below), whose sum is σ = 51247945194264. Its totient is φ = 6183604307232.

The previous prime is 21010201122187. The next prime is 21010201122277. The reversal of 21010201122222 is 22222110201012.

It is a happy number.

21010201122222 is a `hidden beast` number, since 210 + 10 + 201 + 1 + 22 + 222 = 666.

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 = 21010201122195 and 21010201122204.

It is a congruent number.

It is an unprimeable number.

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, 84741228 + ... + 84988799.

It is an arithmetic number, because the mean of its divisors is an integer number (711777016587).

Almost surely, 2^{21010201122222} is an apocalyptic number.

21010201122222 is an abundant number, since it is smaller than the sum of its proper divisors (30237744072042).

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

21010201122222 is a wasteful number, since it uses less digits than its factorization.

21010201122222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169730094 (or 169730068 counting only the distinct ones).

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

Adding to 21010201122222 its reverse (22222110201012), we get a palindrome (43232311323234).

The spelling of 21010201122222 in words is "twenty-one trillion, ten billion, two hundred one million, one hundred twenty-two thousand, two hundred twenty-two".