212201011122221 has 16 divisors (see below), whose sum is σ = 233789097960000. Its totient is φ = 190995855024000.

The previous prime is 212201011122203. The next prime is 212201011122271. The reversal of 212201011122221 is 122221110102212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212201011122221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212201011122193 and 212201011122202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212201011122271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49595030 + ... + 53703528.

It is an arithmetic number, because the mean of its divisors is an integer number (14611818622500).

Almost surely, 2^{212201011122221} is an apocalyptic number.

It is an amenable number.

212201011122221 is a deficient number, since it is larger than the sum of its proper divisors (21588086837779).

212201011122221 is a wasteful number, since it uses less digits than its factorization.

212201011122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4155100.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 212201011122221 its reverse (122221110102212), we get a palindrome (334422121224433).

It can be divided in two parts, 2122010 and 11122221, that added together give a palindrome (13244231).

The spelling of 212201011122221 in words is "two hundred twelve trillion, two hundred one billion, eleven million, one hundred twenty-two thousand, two hundred twenty-one".