212212211101221 has 8 divisors (see below), whose sum is σ = 284123679594304. Its totient is φ = 140887775004480.

The previous prime is 212212211101217. The next prime is 212212211101229. The reversal of 212212211101221 is 122101112212212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 212212211101221 - 2² = 212212211101217 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 (212212211101229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146758098241 + ... + 146758099686.

It is an arithmetic number, because the mean of its divisors is an integer number (35515459949288).

Almost surely, 2^{212212211101221} is an apocalyptic number.

It is an amenable number.

212212211101221 is a deficient number, since it is larger than the sum of its proper divisors (71911468493083).

212212211101221 is a wasteful number, since it uses less digits than its factorization.

212212211101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293516198171.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 212212211101221 its reverse (122101112212212), we get a palindrome (334313323313433).

The spelling of 212212211101221 in words is "two hundred twelve trillion, two hundred twelve billion, two hundred eleven million, one hundred one thousand, two hundred twenty-one".