210111112220121 has 24 divisors (see below), whose sum is σ = 346850841964224. Its totient is φ = 120063232406880.

The previous prime is 210111112220099. The next prime is 210111112220209. The reversal of 210111112220121 is 121022211111012.

It is a happy number.

210111112220121 is a `hidden beast` number, since 210 + 1 + 1 + 1 + 112 + 220 + 121 = 666.

It is not a de Polignac number, because 210111112220121 - 2³⁸ = 209836234313177 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210111112220094 and 210111112220103.

It is not an unprimeable number, because it can be changed into a prime (210111112220521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27828850 + ... + 34563956.

It is an arithmetic number, because the mean of its divisors is an integer number (14452118415176).

Almost surely, 2^{210111112220121} is an apocalyptic number.

210111112220121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

210111112220121 is a deficient number, since it is larger than the sum of its proper divisors (136739729744103).

210111112220121 is a wasteful number, since it uses less digits than its factorization.

210111112220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7230301 (or 7230298 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 210111112220121 its reverse (121022211111012), we get a palindrome (331133323331133).

The spelling of 210111112220121 in words is "two hundred ten trillion, one hundred eleven billion, one hundred twelve million, two hundred twenty thousand, one hundred twenty-one".