212101110221 has 32 divisors (see below), whose sum is σ = 285101365248. Its totient is φ = 152387605440.

The previous prime is 212101110217. The next prime is 212101110233. The reversal of 212101110221 is 122011101212.

It is not a de Polignac number, because 212101110221 - 2² = 212101110217 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 212101110196 and 212101110205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212101110121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 768446 + ... + 1007328.

It is an arithmetic number, because the mean of its divisors is an integer number (8909417664).

Almost surely, 2^212101110221 is an apocalyptic number.

It is an amenable number.

212101110221 is a deficient number, since it is larger than the sum of its proper divisors (73000255027).

212101110221 is a wasteful number, since it uses less digits than its factorization.

212101110221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239801.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 212101110221 its reverse (122011101212), we get a palindrome (334112211433).

Subtracting from 212101110221 its reverse (122011101212), we obtain a palindrome (90090009009).

The spelling of 212101110221 in words is "two hundred twelve billion, one hundred one million, one hundred ten thousand, two hundred twenty-one".