11222011121221 has 4 divisors (see below), whose sum is σ = 11222057293600. Its totient is φ = 11221964948844.

The previous prime is 11222011121179. The next prime is 11222011121231. The reversal of 11222011121221 is 12212111022211.

It is a happy number.

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 11222011121221 - 2¹³ = 11222011113029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11222011121231) 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 3 ways as a sum of consecutive naturals, for example, 22719681 + ... + 23208358.

It is an arithmetic number, because the mean of its divisors is an integer number (2805514323400).

Almost surely, 2^{11222011121221} is an apocalyptic number.

It is an amenable number.

11222011121221 is a deficient number, since it is larger than the sum of its proper divisors (46172379).

11222011121221 is an equidigital number, since it uses as much as digits as its factorization.

11222011121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46172378.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 11222011121221 its reverse (12212111022211), we get a palindrome (23434122143432).

It can be divided in two parts, 1122201 and 1121221, that added together give a palindrome (2243422).

The spelling of 11222011121221 in words is "eleven trillion, two hundred twenty-two billion, eleven million, one hundred twenty-one thousand, two hundred twenty-one".