211111210121 has 8 divisors (see below), whose sum is σ = 244324005120. Its totient is φ = 178661927808.

The previous prime is 211111210117. The next prime is 211111210157. The reversal of 211111210121 is 121012111112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 211111210121 - 2² = 211111210117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211111210096 and 211111210105.

It is not an unprimeable number, because it can be changed into a prime (211111213121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190877576 + ... + 190878681.

It is an arithmetic number, because the mean of its divisors is an integer number (30540500640).

Almost surely, 2^211111210121 is an apocalyptic number.

It is an amenable number.

211111210121 is a deficient number, since it is larger than the sum of its proper divisors (33212794999).

211111210121 is an equidigital number, since it uses as much as digits as its factorization.

211111210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381756343.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 211111210121 its reverse (121012111112), we get a palindrome (332123321233).

Subtracting from 211111210121 its reverse (121012111112), we obtain a palindrome (90099099009).

The spelling of 211111210121 in words is "two hundred eleven billion, one hundred eleven million, two hundred ten thousand, one hundred twenty-one".