210120112121 has 4 divisors (see below), whose sum is σ = 210165884544. Its totient is φ = 210074339700.

The previous prime is 210120112117. The next prime is 210120112141. The reversal of 210120112121 is 121211021012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 210120112121 - 2² = 210120112117 is a prime.

It is a super-2 number, since 2×210120112121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210120112096 and 210120112105.

It is not an unprimeable number, because it can be changed into a prime (210120112141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22879325 + ... + 22888506.

It is an arithmetic number, because the mean of its divisors is an integer number (52541471136).

Almost surely, 2^210120112121 is an apocalyptic number.

It is an amenable number.

210120112121 is a deficient number, since it is larger than the sum of its proper divisors (45772423).

210120112121 is an equidigital number, since it uses as much as digits as its factorization.

210120112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45772422.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 210120112121 its reverse (121211021012), we get a palindrome (331331133133).

The spelling of 210120112121 in words is "two hundred ten billion, one hundred twenty million, one hundred twelve thousand, one hundred twenty-one".