11643512221 has 8 divisors (see below), whose sum is σ = 12719350944. Its totient is φ = 10570563120.

The previous prime is 11643512213. The next prime is 11643512297. The reversal of 11643512221 is 12221534611.

11643512221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11643512221 - 2³ = 11643512213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11643512221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11643512201) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 713971 + ... + 730096.

It is an arithmetic number, because the mean of its divisors is an integer number (1589918868).

Almost surely, 2^11643512221 is an apocalyptic number.

11643512221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11643512221 is a deficient number, since it is larger than the sum of its proper divisors (1075838723).

11643512221 is a wasteful number, since it uses less digits than its factorization.

11643512221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1444811.

The product of its digits is 2880, while the sum is 28.

The spelling of 11643512221 in words is "eleven billion, six hundred forty-three million, five hundred twelve thousand, two hundred twenty-one".