211221212122211 has 8 divisors (see below), whose sum is σ = 222588781082880. Its totient is φ = 199878709467528.

The previous prime is 211221212122187. The next prime is 211221212122243. The reversal of 211221212122211 is 112221212122112.

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 211221212122211 - 2²² = 211221207927907 is a prime.

It is a super-2 number, since 2×211221212122211² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211221212122411) 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, 6266559191 + ... + 6266592896.

It is an arithmetic number, because the mean of its divisors is an integer number (27823597635360).

Almost surely, 2^{211221212122211} is an apocalyptic number.

211221212122211 is a deficient number, since it is larger than the sum of its proper divisors (11367568960669).

211221212122211 is a wasteful number, since it uses less digits than its factorization.

211221212122211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12533152993.

The product of its digits is 256, while the sum is 23.

Adding to 211221212122211 its reverse (112221212122112), we get a palindrome (323442424244323).

Subtracting from 211221212122211 its reverse (112221212122112), we obtain a palindrome (99000000000099).

The spelling of 211221212122211 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred twelve million, one hundred twenty-two thousand, two hundred eleven".