212221101211121 has 4 divisors (see below), whose sum is σ = 212221433833332. Its totient is φ = 212220768588912.

The previous prime is 212221101211087. The next prime is 212221101211169. The reversal of 212221101211121 is 121112101122212.

It is a happy number.

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 115659033651121 + 96562067560000 = 10754489^2 + 9826600^2 .

It is a cyclic number.

It is not a de Polignac number, because 212221101211121 - 2⁶ = 212221101211057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212221101211093 and 212221101211102.

It is not an unprimeable number, because it can be changed into a prime (212221101219121) 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, 165352226 + ... + 166630731.

It is an arithmetic number, because the mean of its divisors is an integer number (53055358458333).

Almost surely, 2^{212221101211121} is an apocalyptic number.

It is an amenable number.

212221101211121 is a deficient number, since it is larger than the sum of its proper divisors (332622211).

212221101211121 is an equidigital number, since it uses as much as digits as its factorization.

212221101211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332622210.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 212221101211121 its reverse (121112101122212), we get a palindrome (333333202333333).

The spelling of 212221101211121 in words is "two hundred twelve trillion, two hundred twenty-one billion, one hundred one million, two hundred eleven thousand, one hundred twenty-one".