11512021025 has 6 divisors (see below), whose sum is σ = 14274906102. Its totient is φ = 9209616800.

The previous prime is 11512021021. The next prime is 11512021043. The reversal of 11512021025 is 52012021511.

It can be written as a sum of positive squares in 3 ways, for example, as 73290721 + 11438730304 = 8561^2 + 106952^2 .

It is not a de Polignac number, because 11512021025 - 2² = 11512021021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11512020988 and 11512021006.

It is not an unprimeable number, because it can be changed into a prime (11512021021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 230240396 + ... + 230240445.

It is an arithmetic number, because the mean of its divisors is an integer number (2379151017).

Almost surely, 2^11512021025 is an apocalyptic number.

It is an amenable number.

11512021025 is a deficient number, since it is larger than the sum of its proper divisors (2762885077).

11512021025 is an equidigital number, since it uses as much as digits as its factorization.

11512021025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460480851 (or 460480846 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 20.

Adding to 11512021025 its reverse (52012021511), we get a palindrome (63524042536).

The spelling of 11512021025 in words is "eleven billion, five hundred twelve million, twenty-one thousand, twenty-five".