11212212022221 has 32 divisors (see below), whose sum is σ = 17828935170048. Its totient is φ = 6128131584960.

The previous prime is 11212212022213. The next prime is 11212212022259. The reversal of 11212212022221 is 12222021221211.

It is not a de Polignac number, because 11212212022221 - 2³ = 11212212022213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11212212022421) 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 31 ways as a sum of consecutive naturals, for example, 10177986 + ... + 11225676.

It is an arithmetic number, because the mean of its divisors is an integer number (557154224064).

Almost surely, 2^{11212212022221} is an apocalyptic number.

It is an amenable number.

11212212022221 is a deficient number, since it is larger than the sum of its proper divisors (6616723147827).

11212212022221 is a wasteful number, since it uses less digits than its factorization.

11212212022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1069881.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 11212212022221 its reverse (12222021221211), we get a palindrome (23434233243432).

The spelling of 11212212022221 in words is "eleven trillion, two hundred twelve billion, two hundred twelve million, twenty-two thousand, two hundred twenty-one".