11221120121 has 2 divisors, whose sum is σ = 11221120122. Its totient is φ = 11221120120.

The previous prime is 11221120093. The next prime is 11221120151. The reversal of 11221120121 is 12102112211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6856668025 + 4364452096 = 82805^2 + 66064^2 .

It is a cyclic number.

It is not a de Polignac number, because 11221120121 - 2²² = 11216925817 is a prime.

It is a super-2 number, since 2×11221120121² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11221120096 and 11221120105.

It is not a weakly prime, because it can be changed into another prime (11221120151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5610560060 + 5610560061.

It is an arithmetic number, because the mean of its divisors is an integer number (5610560061).

Almost surely, 2^11221120121 is an apocalyptic number.

It is an amenable number.

11221120121 is a deficient number, since it is larger than the sum of its proper divisors (1).

11221120121 is an equidigital number, since it uses as much as digits as its factorization.

11221120121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 11221120121 its reverse (12102112211), we get a palindrome (23323232332).

The spelling of 11221120121 in words is "eleven billion, two hundred twenty-one million, one hundred twenty thousand, one hundred twenty-one".