11021212121021 has 4 divisors (see below), whose sum is σ = 11077157360412. Its totient is φ = 10965266881632.

The previous prime is 11021212120999. The next prime is 11021212121027. The reversal of 11021212121021 is 12012121212011.

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 9600169315396 + 1421042805625 = 3098414^2 + 1192075^2 .

It is a cyclic number.

It is not a de Polignac number, because 11021212121021 - 2³⁴ = 11004032251837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11021212121027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27972619400 + ... + 27972619793.

It is an arithmetic number, because the mean of its divisors is an integer number (2769289340103).

Almost surely, 2^{11021212121021} is an apocalyptic number.

It is an amenable number.

11021212121021 is a deficient number, since it is larger than the sum of its proper divisors (55945239391).

11021212121021 is an equidigital number, since it uses as much as digits as its factorization.

11021212121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55945239390.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 11021212121021 its reverse (12012121212011), we get a palindrome (23033333333032).

The spelling of 11021212121021 in words is "eleven trillion, twenty-one billion, two hundred twelve million, one hundred twenty-one thousand, twenty-one".