210120121211111 has 16 divisors (see below), whose sum is σ = 214634920435200. Its totient is φ = 205637274314400.

The previous prime is 210120121210933. The next prime is 210120121211113. The reversal of 210120121211111 is 111112121021012.

It is a cyclic number.

It is not a de Polignac number, because 210120121211111 - 2¹⁸ = 210120120948967 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 210120121211111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210120121211113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142904006 + ... + 144366876.

It is an arithmetic number, because the mean of its divisors is an integer number (13414682527200).

Almost surely, 2^{210120121211111} is an apocalyptic number.

210120121211111 is a deficient number, since it is larger than the sum of its proper divisors (4514799224089).

210120121211111 is a wasteful number, since it uses less digits than its factorization.

210120121211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1473790.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 210120121211111 its reverse (111112121021012), we get a palindrome (321232242232123).

The spelling of 210120121211111 in words is "two hundred ten trillion, one hundred twenty billion, one hundred twenty-one million, two hundred eleven thousand, one hundred eleven".