212102111121 has 8 divisors (see below), whose sum is σ = 282843260544. Its totient is φ = 141381184560.

The previous prime is 212102111113. The next prime is 212102111161. The reversal of 212102111121 is 121111201212.

It is a happy number.

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

It is not a de Polignac number, because 212102111121 - 2³ = 212102111113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212102111121.

It is not an unprimeable number, because it can be changed into a prime (212102111161) 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, 5031225 + ... + 5073206.

It is an arithmetic number, because the mean of its divisors is an integer number (35355407568).

Almost surely, 2^212102111121 is an apocalyptic number.

It is an amenable number.

212102111121 is a deficient number, since it is larger than the sum of its proper divisors (70741149423).

212102111121 is a wasteful number, since it uses less digits than its factorization.

212102111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10111431.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 212102111121 its reverse (121111201212), we get a palindrome (333213312333).

Subtracting from 212102111121 its reverse (121111201212), we obtain a palindrome (90990909909).

The spelling of 212102111121 in words is "two hundred twelve billion, one hundred two million, one hundred eleven thousand, one hundred twenty-one".