210111220122221 has 16 divisors (see below), whose sum is σ = 231485608384128. Its totient is φ = 189115790952000.

The previous prime is 210111220122173. The next prime is 210111220122241. The reversal of 210111220122221 is 122221022111012.

It is not a de Polignac number, because 210111220122221 - 2⁴⁶ = 139742475944557 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210111220122193 and 210111220122202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210111220122241) 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 15 ways as a sum of consecutive naturals, for example, 64928195 + ... + 68087391.

It is an arithmetic number, because the mean of its divisors is an integer number (14467850524008).

Almost surely, 2^{210111220122221} is an apocalyptic number.

It is an amenable number.

210111220122221 is a deficient number, since it is larger than the sum of its proper divisors (21374388261907).

210111220122221 is a wasteful number, since it uses less digits than its factorization.

210111220122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3219172.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 210111220122221 its reverse (122221022111012), we get a palindrome (332332242233233).

The spelling of 210111220122221 in words is "two hundred ten trillion, one hundred eleven billion, two hundred twenty million, one hundred twenty-two thousand, two hundred twenty-one".