11221212112021 has 24 divisors (see below), whose sum is σ = 11978560898304. Its totient is φ = 10509083907840.

The previous prime is 11221212112009. The next prime is 11221212112043. The reversal of 11221212112021 is 12021121212211.

It is a happy number.

It is not a de Polignac number, because 11221212112021 - 2²⁹ = 11220675241109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

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 11221212112021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11221212112921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30738556 + ... + 31101466.

It is an arithmetic number, because the mean of its divisors is an integer number (499106704096).

Almost surely, 2^{11221212112021} is an apocalyptic number.

It is an amenable number.

11221212112021 is a deficient number, since it is larger than the sum of its proper divisors (757348786283).

11221212112021 is an equidigital number, since it uses as much as digits as its factorization.

11221212112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363929 (or 363910 counting only the distinct ones).

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

Adding to 11221212112021 its reverse (12021121212211), we get a palindrome (23242333324232).

The spelling of 11221212112021 in words is "eleven trillion, two hundred twenty-one billion, two hundred twelve million, one hundred twelve thousand, twenty-one".