11212222121021 has 4 divisors (see below), whose sum is σ = 11212499095392. Its totient is φ = 11211945146652.

The previous prime is 11212222121017. The next prime is 11212222121099. The reversal of 11212222121021 is 12012122221211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11212222121021 - 2² = 11212222121017 is a prime.

It is a super-2 number, since 2×11212222121021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11212222120984 and 11212222121002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11212222127021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138426455 + ... + 138507428.

It is an arithmetic number, because the mean of its divisors is an integer number (2803124773848).

Almost surely, 2^{11212222121021} is an apocalyptic number.

It is an amenable number.

11212222121021 is a deficient number, since it is larger than the sum of its proper divisors (276974371).

11212222121021 is an equidigital number, since it uses as much as digits as its factorization.

11212222121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276974370.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 11212222121021 its reverse (12012122221211), we get a palindrome (23224344342232).

The spelling of 11212222121021 in words is "eleven trillion, two hundred twelve billion, two hundred twenty-two million, one hundred twenty-one thousand, twenty-one".