11121021211 has 4 divisors (see below), whose sum is σ = 11121729192. Its totient is φ = 11120313232.

The previous prime is 11121021199. The next prime is 11121021227. The reversal of 11121021211 is 11212012111.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11121021211 - 2⁷ = 11121021083 is a prime.

It is a super-2 number, since 2×11121021211² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11121021191 and 11121021200.

It is not an unprimeable number, because it can be changed into a prime (11121021311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 329881 + ... + 362026.

It is an arithmetic number, because the mean of its divisors is an integer number (2780432298).

Almost surely, 2^11121021211 is an apocalyptic number.

11121021211 is a deficient number, since it is larger than the sum of its proper divisors (707981).

11121021211 is an equidigital number, since it uses as much as digits as its factorization.

11121021211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707980.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 11121021211 its reverse (11212012111), we get a palindrome (22333033322).

The spelling of 11121021211 in words is "eleven billion, one hundred twenty-one million, twenty-one thousand, two hundred eleven".