212102211111 has 48 divisors (see below), whose sum is σ = 342203007744. Its totient is φ = 114454124928.

The previous prime is 212102210939. The next prime is 212102211119. The reversal of 212102211111 is 111112201212.

It is a happy number.

It is not a de Polignac number, because 212102211111 - 2¹¹ = 212102209063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212102211119) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2328160 + ... + 2417546.

It is an arithmetic number, because the mean of its divisors is an integer number (7129229328).

Almost surely, 2^212102211111 is an apocalyptic number.

212102211111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

212102211111 is a deficient number, since it is larger than the sum of its proper divisors (130100796633).

212102211111 is a wasteful number, since it uses less digits than its factorization.

212102211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89748 (or 89729 counting only the distinct ones).

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

Adding to 212102211111 its reverse (111112201212), we get a palindrome (323214412323).

The spelling of 212102211111 in words is "two hundred twelve billion, one hundred two million, two hundred eleven thousand, one hundred eleven".