11011220021121 has 4 divisors (see below), whose sum is σ = 14681626694832. Its totient is φ = 7340813347412.

The previous prime is 11011220021083. The next prime is 11011220021143. The reversal of 11011220021121 is 12112002211011.

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 11011220021121 - 2¹⁸ = 11011219758977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11011220021121.

It is not an unprimeable number, because it can be changed into a prime (11011220021521) 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, 1835203336851 + ... + 1835203336856.

It is an arithmetic number, because the mean of its divisors is an integer number (3670406673708).

Almost surely, 2^{11011220021121} is an apocalyptic number.

It is an amenable number.

11011220021121 is a deficient number, since it is larger than the sum of its proper divisors (3670406673711).

11011220021121 is an equidigital number, since it uses as much as digits as its factorization.

11011220021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3670406673710.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 11011220021121 its reverse (12112002211011), we get a palindrome (23123222232132).

The spelling of 11011220021121 in words is "eleven trillion, eleven billion, two hundred twenty million, twenty-one thousand, one hundred twenty-one".