211211111022111 has 12 divisors (see below), whose sum is σ = 313328194729992. Its totient is φ = 137001801743856.

The previous prime is 211211111022097. The next prime is 211211111022127. The reversal of 211211111022111 is 111220111112112.

211211111022111 is a `hidden beast` number, since 211 + 2 + 111 + 110 + 221 + 11 = 666.

It is not a de Polignac number, because 211211111022111 - 2¹⁹ = 211211110497823 is a prime.

It is a super-2 number, since 2×211211111022111² (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 (211211111022011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 317133800001 + ... + 317133800666.

It is an arithmetic number, because the mean of its divisors is an integer number (26110682894166).

Almost surely, 2^{211211111022111} is an apocalyptic number.

211211111022111 is a deficient number, since it is larger than the sum of its proper divisors (102117083707881).

211211111022111 is a wasteful number, since it uses less digits than its factorization.

211211111022111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634267600710 (or 634267600707 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 18.

Adding to 211211111022111 its reverse (111220111112112), we get a palindrome (322431222134223).

Subtracting from 211211111022111 its reverse (111220111112112), we obtain a palindrome (99990999909999).

The spelling of 211211111022111 in words is "two hundred eleven trillion, two hundred eleven billion, one hundred eleven million, twenty-two thousand, one hundred eleven".