11212211211021 has 48 divisors (see below), whose sum is σ = 16695229611840. Its totient is φ = 7245643207680.

The previous prime is 11212211210999. The next prime is 11212211211029. The reversal of 11212211211021 is 12011211221211.

It is a happy number.

11212211211021 is a `hidden beast` number, since 11 + 212 + 211 + 211 + 0 + 21 = 666.

It is not a de Polignac number, because 11212211211021 - 2³⁰ = 11211137469197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11212211210985 and 11212211211003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11212211211029) 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 47 ways as a sum of consecutive naturals, for example, 680303101 + ... + 680319581.

It is an arithmetic number, because the mean of its divisors is an integer number (347817283580).

Almost surely, 2^{11212211211021} is an apocalyptic number.

It is an amenable number.

11212211211021 is a deficient number, since it is larger than the sum of its proper divisors (5483018400819).

11212211211021 is a wasteful number, since it uses less digits than its factorization.

11212211211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24026 (or 24023 counting only the distinct ones).

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

Adding to 11212211211021 its reverse (12011211221211), we get a palindrome (23223422432232).

The spelling of 11212211211021 in words is "eleven trillion, two hundred twelve billion, two hundred eleven million, two hundred eleven thousand, twenty-one".