12021632565 has 16 divisors (see below), whose sum is σ = 19425056256. Its totient is φ = 6348056000.

The previous prime is 12021632549. The next prime is 12021632573. The reversal of 12021632565 is 56523612021.

12021632565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12021632565 - 2⁴ = 12021632549 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3966021 + ... + 3969050.

It is an arithmetic number, because the mean of its divisors is an integer number (1214066016).

Almost surely, 2^12021632565 is an apocalyptic number.

12021632565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12021632565 is a deficient number, since it is larger than the sum of its proper divisors (7403423691).

12021632565 is a wasteful number, since it uses less digits than its factorization.

12021632565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7935180.

The product of its (nonzero) digits is 21600, while the sum is 33.

The spelling of 12021632565 in words is "twelve billion, twenty-one million, six hundred thirty-two thousand, five hundred sixty-five".