211212102021111 has 6 divisors (see below), whose sum is σ = 305084147363840. Its totient is φ = 140808068014068.

The previous prime is 211212102021079. The next prime is 211212102021199. The reversal of 211212102021111 is 111120201212112.

It is a happy number.

211212102021111 is a `hidden beast` number, since 21 + 121 + 210 + 202 + 1 + 111 = 666.

It is not a de Polignac number, because 211212102021111 - 2⁵ = 211212102021079 is a prime.

It is a super-3 number, since 3×211212102021111³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211212102021911) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11734005667831 + ... + 11734005667848.

Almost surely, 2^{211212102021111} is an apocalyptic number.

211212102021111 is a deficient number, since it is larger than the sum of its proper divisors (93872045342729).

211212102021111 is a wasteful number, since it uses less digits than its factorization.

211212102021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23468011335685 (or 23468011335682 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 211212102021111 its reverse (111120201212112), we get a palindrome (322332303233223).

The spelling of 211212102021111 in words is "two hundred eleven trillion, two hundred twelve billion, one hundred two million, twenty-one thousand, one hundred eleven".