11211212000221 has 4 divisors (see below), whose sum is σ = 11597805517500. Its totient is φ = 10824618482944.

The previous prime is 11211212000201. The next prime is 11211212000237. The reversal of 11211212000221 is 12200021211211.

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 6461819924121 + 4749392076100 = 2542011^2 + 2179310^2 .

It is a cyclic number.

It is not a de Polignac number, because 11211212000221 - 2⁹ = 11211211999709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11211212000195 and 11211212000204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211212000201) 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, 193296758596 + ... + 193296758653.

It is an arithmetic number, because the mean of its divisors is an integer number (2899451379375).

Almost surely, 2^{11211212000221} is an apocalyptic number.

It is an amenable number.

11211212000221 is a deficient number, since it is larger than the sum of its proper divisors (386593517279).

11211212000221 is an equidigital number, since it uses as much as digits as its factorization.

11211212000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386593517278.

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

Adding to 11211212000221 its reverse (12200021211211), we get a palindrome (23411233211432).

The spelling of 11211212000221 in words is "eleven trillion, two hundred eleven billion, two hundred twelve million, two hundred twenty-one", and thus it is an aban number.