210121102111 has 4 divisors (see below), whose sum is σ = 211531311000. Its totient is φ = 208710893224.

The previous prime is 210121102073. The next prime is 210121102117. The reversal of 210121102111 is 111201121012.

It is a happy number.

210121102111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210121102111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210121102091 and 210121102100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210121102117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 705104221 + ... + 705104518.

It is an arithmetic number, because the mean of its divisors is an integer number (52882827750).

Almost surely, 2^210121102111 is an apocalyptic number.

210121102111 is a deficient number, since it is larger than the sum of its proper divisors (1410208889).

210121102111 is a wasteful number, since it uses less digits than its factorization.

210121102111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1410208888.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 210121102111 its reverse (111201121012), we get a palindrome (321322223123).

The spelling of 210121102111 in words is "two hundred ten billion, one hundred twenty-one million, one hundred two thousand, one hundred eleven".