11112121202221 has 8 divisors (see below), whose sum is σ = 11980863478584. Its totient is φ = 10245373743360.

The previous prime is 11112121202159. The next prime is 11112121202233. The reversal of 11112121202221 is 12220212121111.

It is a happy number.

11112121202221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 950116118121 + 10162005084100 = 974739^2 + 3187790^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 11112121202221 - 2¹³ = 11112121194029 is a prime.

It is a super-2 number, since 2×11112121202221² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11112121202291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 498692800 + ... + 498715081.

It is an arithmetic number, because the mean of its divisors is an integer number (1497607934823).

Almost surely, 2^{11112121202221} is an apocalyptic number.

It is an amenable number.

11112121202221 is a deficient number, since it is larger than the sum of its proper divisors (868742276363).

11112121202221 is an equidigital number, since it uses as much as digits as its factorization.

11112121202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997408751.

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

Adding to 11112121202221 its reverse (12220212121111), we get a palindrome (23332333323332).

The spelling of 11112121202221 in words is "eleven trillion, one hundred twelve billion, one hundred twenty-one million, two hundred two thousand, two hundred twenty-one".