212110020122221 has 4 divisors (see below), whose sum is σ = 228426175516252. Its totient is φ = 195793864728192.

The previous prime is 212110020122207. The next prime is 212110020122227. The reversal of 212110020122221 is 122221020011212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34031297313225 + 178078722808996 = 5833635^2 + 13344614^2 .

It is a cyclic number.

It is not a de Polignac number, because 212110020122221 - 2³¹ = 212107872638573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212110020122227) 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, 8158077696996 + ... + 8158077697021.

It is an arithmetic number, because the mean of its divisors is an integer number (57106543879063).

Almost surely, 2^{212110020122221} is an apocalyptic number.

It is an amenable number.

212110020122221 is a deficient number, since it is larger than the sum of its proper divisors (16316155394031).

212110020122221 is a wasteful number, since it uses less digits than its factorization.

212110020122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16316155394030.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 212110020122221 its reverse (122221020011212), we get a palindrome (334331040133433).

The spelling of 212110020122221 in words is "two hundred twelve trillion, one hundred ten billion, twenty million, one hundred twenty-two thousand, two hundred twenty-one".