11200021121 has 4 divisors (see below), whose sum is σ = 11200658772. Its totient is φ = 11199383472.

The previous prime is 11200021117. The next prime is 11200021139. The reversal of 11200021121 is 12112000211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12112000211 = 6761 ⋅1791451.

It can be written as a sum of positive squares in 2 ways, for example, as 7580314225 + 3619706896 = 87065^2 + 60164^2 .

It is a cyclic number.

It is not a de Polignac number, because 11200021121 - 2² = 11200021117 is a prime.

It is a super-2 number, since 2×11200021121² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11200021111) 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, 291710 + ... + 327863.

It is an arithmetic number, because the mean of its divisors is an integer number (2800164693).

Almost surely, 2^11200021121 is an apocalyptic number.

It is an amenable number.

11200021121 is a deficient number, since it is larger than the sum of its proper divisors (637651).

11200021121 is an equidigital number, since it uses as much as digits as its factorization.

11200021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637650.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 11200021121 its reverse (12112000211), we get a palindrome (23312021332).

The spelling of 11200021121 in words is "eleven billion, two hundred million, twenty-one thousand, one hundred twenty-one".