211221121122111 has 8 divisors (see below), whose sum is σ = 282723990919344. Its totient is φ = 140266166036480.

The previous prime is 211221121122101. The next prime is 211221121122113. The reversal of 211221121122111 is 111221121122112.

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 211221121122111 - 2⁵ = 211221121122079 is a prime.

It is a super-2 number, since 2×211221121122111² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221121122113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136978677000 + ... + 136978678541.

It is an arithmetic number, because the mean of its divisors is an integer number (35340498864918).

Almost surely, 2^{211221121122111} is an apocalyptic number.

211221121122111 is a deficient number, since it is larger than the sum of its proper divisors (71502869797233).

211221121122111 is a wasteful number, since it uses less digits than its factorization.

211221121122111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273957355801.

The product of its digits is 64, while the sum is 21.

Adding to 211221121122111 its reverse (111221121122112), we get a palindrome (322442242244223).

Subtracting from 211221121122111 its reverse (111221121122112), we obtain a palindrome (99999999999999).

The spelling of 211221121122111 in words is "two hundred eleven trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred twenty-two thousand, one hundred eleven".