210101122112221 has 8 divisors (see below), whose sum is σ = 222871213158264. Its totient is φ = 197376720122880.

The previous prime is 210101122112191. The next prime is 210101122112227. The reversal of 210101122112221 is 122211221101012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 16264726032025 + 193836396080196 = 4032955^2 + 13922514^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 210101122112221 - 2³¹ = 210098974628573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210101122112227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11422254700 + ... + 11422273093.

It is an arithmetic number, because the mean of its divisors is an integer number (27858901644783).

Almost surely, 2^{210101122112221} is an apocalyptic number.

It is an amenable number.

210101122112221 is a deficient number, since it is larger than the sum of its proper divisors (12770091046043).

210101122112221 is a wasteful number, since it uses less digits than its factorization.

210101122112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22844528351.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 210101122112221 its reverse (122211221101012), we get a palindrome (332312343213233).

The spelling of 210101122112221 in words is "two hundred ten trillion, one hundred one billion, one hundred twenty-two million, one hundred twelve thousand, two hundred twenty-one".