11520421201 has 4 divisors (see below), whose sum is σ = 11548588900. Its totient is φ = 11492253504.

The previous prime is 11520421181. The next prime is 11520421273. The reversal of 11520421201 is 10212402511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10212402511 = 19 ⋅537494869.

It can be written as a sum of positive squares in 2 ways, for example, as 5952276801 + 5568144400 = 77151^2 + 74620^2 .

It is a cyclic number.

It is not a de Polignac number, because 11520421201 - 2²¹ = 11518324049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11520421001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14083236 + ... + 14084053.

It is an arithmetic number, because the mean of its divisors is an integer number (2887147225).

Almost surely, 2^11520421201 is an apocalyptic number.

It is an amenable number.

11520421201 is a deficient number, since it is larger than the sum of its proper divisors (28167699).

11520421201 is an equidigital number, since it uses as much as digits as its factorization.

11520421201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28167698.

The product of its (nonzero) digits is 160, while the sum is 19.

Adding to 11520421201 its reverse (10212402511), we get a palindrome (21732823712).

The spelling of 11520421201 in words is "eleven billion, five hundred twenty million, four hundred twenty-one thousand, two hundred one".