211220202120111 has 16 divisors (see below), whose sum is σ = 312926496126720. Its totient is φ = 140810012903160.

The previous prime is 211220202120049. The next prime is 211220202120113. The reversal of 211220202120111 is 111021202022112.

211220202120111 is a `hidden beast` number, since 2 + 11 + 220 + 202 + 120 + 111 = 666.

It is not a de Polignac number, because 211220202120111 - 2¹⁴ = 211220202103727 is a prime.

It is a super-2 number, since 2×211220202120111² (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 (211220202120113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94856155 + ... + 97057356.

It is an arithmetic number, because the mean of its divisors is an integer number (19557906007920).

Almost surely, 2^{211220202120111} is an apocalyptic number.

211220202120111 is a deficient number, since it is larger than the sum of its proper divisors (101706294006609).

211220202120111 is a wasteful number, since it uses less digits than its factorization.

211220202120111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191954283 (or 191954277 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 211220202120111 its reverse (111021202022112), we get a palindrome (322241404142223).

The spelling of 211220202120111 in words is "two hundred eleven trillion, two hundred twenty billion, two hundred two million, one hundred twenty thousand, one hundred eleven".