11212221112021 has 4 divisors (see below), whose sum is σ = 11212256819052. Its totient is φ = 11212185404992.

The previous prime is 11212221112019. The next prime is 11212221112039. The reversal of 11212221112021 is 12021112221211.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7546091410225 + 3666129701796 = 2747015^2 + 1914714^2 .

It is a cyclic number.

It is not a de Polignac number, because 11212221112021 - 2¹ = 11212221112019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11212221112021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11212221115021) 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 3 ways as a sum of consecutive naturals, for example, 17378290 + ... + 18011923.

It is an arithmetic number, because the mean of its divisors is an integer number (2803064204763).

Almost surely, 2^{11212221112021} is an apocalyptic number.

It is an amenable number.

11212221112021 is a deficient number, since it is larger than the sum of its proper divisors (35707031).

11212221112021 is an equidigital number, since it uses as much as digits as its factorization.

11212221112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35707030.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 11212221112021 its reverse (12021112221211), we get a palindrome (23233333333232).

The spelling of 11212221112021 in words is "eleven trillion, two hundred twelve billion, two hundred twenty-one million, one hundred twelve thousand, twenty-one".