212112210221221 has 8 divisors (see below), whose sum is σ = 228721767120000. Its totient is φ = 196047228958560.

The previous prime is 212112210221213. The next prime is 212112210221243. The reversal of 212112210221221 is 122122012211212.

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 212112210221221 - 2³ = 212112210221213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212112210221192 and 212112210221201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212112210221521) 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, 136143908221 + ... + 136143909778.

It is an arithmetic number, because the mean of its divisors is an integer number (28590220890000).

Almost surely, 2^{212112210221221} is an apocalyptic number.

It is an amenable number.

212112210221221 is a deficient number, since it is larger than the sum of its proper divisors (16609556898779).

212112210221221 is a wasteful number, since it uses less digits than its factorization.

212112210221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272287818059.

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

Adding to 212112210221221 its reverse (122122012211212), we get a palindrome (334234222432433).

The spelling of 212112210221221 in words is "two hundred twelve trillion, one hundred twelve billion, two hundred ten million, two hundred twenty-one thousand, two hundred twenty-one".