211112111211021 has 48 divisors (see below), whose sum is σ = 319914539363328. Its totient is φ = 133994781619200.

The previous prime is 211112111211013. The next prime is 211112111211061. The reversal of 211112111211021 is 120112111211112.

211112111211021 is a `hidden beast` number, since 211 + 11 + 211 + 1 + 211 + 0 + 21 = 666.

It is not a de Polignac number, because 211112111211021 - 2³ = 211112111211013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211112111210985 and 211112111211003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211112111211061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 70384701 + ... + 73322781.

It is an arithmetic number, because the mean of its divisors is an integer number (6664886236736).

Almost surely, 2^{211112111211021} is an apocalyptic number.

It is an amenable number.

211112111211021 is a deficient number, since it is larger than the sum of its proper divisors (108802428152307).

211112111211021 is a wasteful number, since it uses less digits than its factorization.

211112111211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2942762 (or 2942759 counting only the distinct ones).

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

Adding to 211112111211021 its reverse (120112111211112), we get a palindrome (331224222422133).

Subtracting from 211112111211021 its reverse (120112111211112), we obtain a palindrome (90999999999909).

The spelling of 211112111211021 in words is "two hundred eleven trillion, one hundred twelve billion, one hundred eleven million, two hundred eleven thousand, twenty-one".