210111222222121 has 8 divisors (see below), whose sum is σ = 231106558478688. Its totient is φ = 191010202018900.

The previous prime is 210111222222119. The next prime is 210111222222133. The reversal of 210111222222121 is 121222222111012.

It is not a de Polignac number, because 210111222222121 - 2¹ = 210111222222119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210111222222092 and 210111222222101.

It is not an unprimeable number, because it can be changed into a prime (210111222222721) 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 7 ways as a sum of consecutive naturals, for example, 78929834215 + ... + 78929836876.

It is an arithmetic number, because the mean of its divisors is an integer number (28888319809836).

Almost surely, 2^{210111222222121} is an apocalyptic number.

It is an amenable number.

210111222222121 is a deficient number, since it is larger than the sum of its proper divisors (20995336256567).

210111222222121 is an equidigital number, since it uses as much as digits as its factorization.

210111222222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157859671124 (or 157859671102 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 210111222222121 its reverse (121222222111012), we get a palindrome (331333444333133).

The spelling of 210111222222121 in words is "two hundred ten trillion, one hundred eleven billion, two hundred twenty-two million, two hundred twenty-two thousand, one hundred twenty-one".