11220211212221 has 8 divisors (see below), whose sum is σ = 12361420814688. Its totient is φ = 10099200010000.

The previous prime is 11220211212181. The next prime is 11220211212257. The reversal of 11220211212221 is 12221211202211.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11220211212221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11220211212193 and 11220211212202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11220211212421) 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, 5049598895 + ... + 5049601116.

It is an arithmetic number, because the mean of its divisors is an integer number (1545177601836).

Almost surely, 2^{11220211212221} is an apocalyptic number.

11220211212221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11220211212221 is a deficient number, since it is larger than the sum of its proper divisors (1141209602467).

11220211212221 is a wasteful number, since it uses less digits than its factorization.

11220211212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10099200123.

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

Adding to 11220211212221 its reverse (12221211202211), we get a palindrome (23441422414432).

The spelling of 11220211212221 in words is "eleven trillion, two hundred twenty billion, two hundred eleven million, two hundred twelve thousand, two hundred twenty-one".