211222212101221 has 4 divisors (see below), whose sum is σ = 211242713151232. Its totient is φ = 211201711051212.

The previous prime is 211222212101189. The next prime is 211222212101279. The reversal of 211222212101221 is 122101212222112.

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 211222212101221 - 2⁵ = 211222212101189 is a prime.

It is a super-2 number, since 2×211222212101221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211222212101192 and 211222212101201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211222212101321) 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 3 ways as a sum of consecutive naturals, for example, 10250509551 + ... + 10250530156.

It is an arithmetic number, because the mean of its divisors is an integer number (52810678287808).

Almost surely, 2^{211222212101221} is an apocalyptic number.

It is an amenable number.

211222212101221 is a deficient number, since it is larger than the sum of its proper divisors (20501050011).

211222212101221 is a wasteful number, since it uses less digits than its factorization.

211222212101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20501050010.

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

Adding to 211222212101221 its reverse (122101212222112), we get a palindrome (333323424323333).

The spelling of 211222212101221 in words is "two hundred eleven trillion, two hundred twenty-two billion, two hundred twelve million, one hundred one thousand, two hundred twenty-one".