212011222112221 has 4 divisors (see below), whose sum is σ = 242298539556832. Its totient is φ = 181723904667612.

The previous prime is 212011222112219. The next prime is 212011222112227. The reversal of 212011222112221 is 122211222110212.

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 212011222112221 - 2¹ = 212011222112219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212011222112192 and 212011222112201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212011222112227) 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, 15143658722295 + ... + 15143658722308.

It is an arithmetic number, because the mean of its divisors is an integer number (60574634889208).

Almost surely, 2^{212011222112221} is an apocalyptic number.

It is an amenable number.

212011222112221 is a deficient number, since it is larger than the sum of its proper divisors (30287317444611).

212011222112221 is an equidigital number, since it uses as much as digits as its factorization.

212011222112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30287317444610.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 212011222112221 its reverse (122211222110212), we get a palindrome (334222444222433).

The spelling of 212011222112221 in words is "two hundred twelve trillion, eleven billion, two hundred twenty-two million, one hundred twelve thousand, two hundred twenty-one".