11221212012221 has 8 divisors (see below), whose sum is σ = 11609017104000. Its totient is φ = 10833464703600.

The previous prime is 11221212012187. The next prime is 11221212012223. The reversal of 11221212012221 is 12221021212211.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11221212012221 - 2¹⁰ = 11221212011197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11221212012193 and 11221212012202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11221212012223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14050505 + ... + 14827646.

It is an arithmetic number, because the mean of its divisors is an integer number (1451127138000).

Almost surely, 2^{11221212012221} is an apocalyptic number.

It is an amenable number.

11221212012221 is a deficient number, since it is larger than the sum of its proper divisors (387805091779).

11221212012221 is a wasteful number, since it uses less digits than its factorization.

11221212012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28891579.

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

Adding to 11221212012221 its reverse (12221021212211), we get a palindrome (23442233224432).

The spelling of 11221212012221 in words is "eleven trillion, two hundred twenty-one billion, two hundred twelve million, twelve thousand, two hundred twenty-one".