11123212121011 has 4 divisors (see below), whose sum is σ = 11126978873752. Its totient is φ = 11119445368272.

The previous prime is 11123212121009. The next prime is 11123212121041. The reversal of 11123212121011 is 11012121232111.

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 11123212121011 - 2¹ = 11123212121009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11123212121011.

It is not an unprimeable number, because it can be changed into a prime (11123212121041) 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, 1883371941 + ... + 1883377846.

It is an arithmetic number, because the mean of its divisors is an integer number (2781744718438).

Almost surely, 2^{11123212121011} is an apocalyptic number.

11123212121011 is a deficient number, since it is larger than the sum of its proper divisors (3766752741).

11123212121011 is an equidigital number, since it uses as much as digits as its factorization.

11123212121011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3766752740.

The product of its (nonzero) digits is 48, while the sum is 19.

Adding to 11123212121011 its reverse (11012121232111), we get a palindrome (22135333353122).

The spelling of 11123212121011 in words is "eleven trillion, one hundred twenty-three billion, two hundred twelve million, one hundred twenty-one thousand, eleven".