21154443313 has 8 divisors (see below), whose sum is σ = 21492642528. Its totient is φ = 20818228224.

The previous prime is 21154443259. The next prime is 21154443329. The reversal of 21154443313 is 31334445112.

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 21154443313 - 2⁹ = 21154442801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21154443413) 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, 474531 + ... + 517192.

It is an arithmetic number, because the mean of its divisors is an integer number (2686580316).

Almost surely, 2^21154443313 is an apocalyptic number.

It is an amenable number.

21154443313 is a deficient number, since it is larger than the sum of its proper divisors (338199215).

21154443313 is an equidigital number, since it uses as much as digits as its factorization.

21154443313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992063.

The product of its digits is 17280, while the sum is 31.

Adding to 21154443313 its reverse (31334445112), we get a palindrome (52488888425).

The spelling of 21154443313 in words is "twenty-one billion, one hundred fifty-four million, four hundred forty-three thousand, three hundred thirteen".