11200121 has 4 divisors (see below), whose sum is σ = 11210100. Its totient is φ = 11190144.

The previous prime is 11200109. The next prime is 11200129. The reversal of 11200121 is 12100211.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 9610000 + 1590121 = 3100^2 + 1261^2 .

It is a cyclic number.

It is not a de Polignac number, because 11200121 - 2¹⁴ = 11183737 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11200099 and 11200108.

It is not an unprimeable number, because it can be changed into a prime (11200129) 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, 3056 + ... + 5633.

It is an arithmetic number, because the mean of its divisors is an integer number (2802525).

Almost surely, 2^11200121 is an apocalyptic number.

It is an amenable number.

11200121 is a deficient number, since it is larger than the sum of its proper divisors (9979).

11200121 is an equidigital number, since it uses as much as digits as its factorization.

11200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9978.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 11200121 is about 3346.6581839202. The cubic root of 11200121 is about 223.7385941358.

Adding to 11200121 its reverse (12100211), we get a palindrome (23300332).

The spelling of 11200121 in words is "eleven million, two hundred thousand, one hundred twenty-one".