212101102221 has 4 divisors (see below), whose sum is σ = 282801469632. Its totient is φ = 141400734812.

The previous prime is 212101102207. The next prime is 212101102229. The reversal of 212101102221 is 122201101212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212101102221 - 2⁷ = 212101102093 is a prime.

It is a super-2 number, since 2×212101102221² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 212101102221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212101102229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35350183701 + ... + 35350183706.

It is an arithmetic number, because the mean of its divisors is an integer number (70700367408).

Almost surely, 2^212101102221 is an apocalyptic number.

It is an amenable number.

212101102221 is a deficient number, since it is larger than the sum of its proper divisors (70700367411).

212101102221 is an equidigital number, since it uses as much as digits as its factorization.

212101102221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70700367410.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 212101102221 its reverse (122201101212), we get a palindrome (334302203433).

The spelling of 212101102221 in words is "two hundred twelve billion, one hundred one million, one hundred two thousand, two hundred twenty-one".