11520021465 has 24 divisors (see below), whose sum is σ = 20020752960. Its totient is φ = 6127791264.

The previous prime is 11520021407. The next prime is 11520021467. The reversal of 11520021465 is 56412002511.

It is not a de Polignac number, because 11520021465 - 2¹⁶ = 11519955929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11520021467) 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 23 ways as a sum of consecutive naturals, for example, 320677 + ... + 354786.

It is an arithmetic number, because the mean of its divisors is an integer number (834198040).

Almost surely, 2^11520021465 is an apocalyptic number.

11520021465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11520021465 is a deficient number, since it is larger than the sum of its proper divisors (8500731495).

11520021465 is a wasteful number, since it uses less digits than its factorization.

11520021465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675853 (or 675850 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

Adding to 11520021465 its reverse (56412002511), we get a palindrome (67932023976).

The spelling of 11520021465 in words is "eleven billion, five hundred twenty million, twenty-one thousand, four hundred sixty-five".