11211221021020 has 12 divisors (see below), whose sum is σ = 23543564144184. Its totient is φ = 4484488408400.

The previous prime is 11211221020933. The next prime is 11211221021029. The reversal of 11211221021020 is 2012012211211.

It is a junction number, because it is equal to n+sod(n) for n = 11211221020985 and 11211221021003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211221021029) 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 3 ways as a sum of consecutive naturals, for example, 280280525506 + ... + 280280525545.

It is an arithmetic number, because the mean of its divisors is an integer number (1961963678682).

Almost surely, 2^{11211221021020} is an apocalyptic number.

11211221021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11211221021020 is an abundant number, since it is smaller than the sum of its proper divisors (12332343123164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11211221021020 is a wasteful number, since it uses less digits than its factorization.

11211221021020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560561051060 (or 560561051058 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 11211221021020 its reverse (2012012211211), we get a palindrome (13223233232231).

The spelling of 11211221021020 in words is "eleven trillion, two hundred eleven billion, two hundred twenty-one million, twenty-one thousand, twenty".