11201000121 has 48 divisors (see below), whose sum is σ = 16831706320. Its totient is φ = 7171960320.

The previous prime is 11201000113. The next prime is 11201000141. The reversal of 11201000121 is 12100010211.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 911738025 + 10289262096 = 30195^2 + 101436^2 .

It is not a de Polignac number, because 11201000121 - 2³ = 11201000113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11201000141) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15280671 + ... + 15281403.

Almost surely, 2^11201000121 is an apocalyptic number.

It is an amenable number.

11201000121 is a deficient number, since it is larger than the sum of its proper divisors (5630706199).

11201000121 is a wasteful number, since it uses less digits than its factorization.

11201000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1306 (or 1303 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 11201000121 its reverse (12100010211), we get a palindrome (23301010332).

The spelling of 11201000121 in words is "eleven billion, two hundred one million, one hundred twenty-one", and thus it is an aban number.