212102102221 has 8 divisors (see below), whose sum is σ = 216117644184. Its totient is φ = 208087064640.

The previous prime is 212102102183. The next prime is 212102102237. The reversal of 212102102221 is 122201201212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 92896944100 + 119205158121 = 304790^2 + 345261^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 212102102221 - 2¹⁵ = 212102069453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212102102195 and 212102102204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212102102281) 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, 784555 + ... + 1019671.

It is an arithmetic number, because the mean of its divisors is an integer number (27014705523).

Almost surely, 2^212102102221 is an apocalyptic number.

It is an amenable number.

212102102221 is a deficient number, since it is larger than the sum of its proper divisors (4015541963).

212102102221 is a wasteful number, since it uses less digits than its factorization.

212102102221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252191.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 212102102221 its reverse (122201201212), we get a palindrome (334303303433).

The spelling of 212102102221 in words is "two hundred twelve billion, one hundred two million, one hundred two thousand, two hundred twenty-one".