21152154155513 has 8 divisors (see below), whose sum is σ = 22397517076680. Its totient is φ = 19906915518720.

The previous prime is 21152154155497. The next prime is 21152154155519. The reversal of 21152154155513 is 31555145125112.

It can be written as a sum of positive squares in 4 ways, for example, as 2360856834064 + 18791297321449 = 1536508^2 + 4334893^2 .

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 21152154155513 - 2⁴ = 21152154155497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21152154155519) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30720578 + ... + 31401563.

It is an arithmetic number, because the mean of its divisors is an integer number (2799689634585).

Almost surely, 2^{21152154155513} is an apocalyptic number.

It is an amenable number.

21152154155513 is a deficient number, since it is larger than the sum of its proper divisors (1245362921167).

21152154155513 is a wasteful number, since it uses less digits than its factorization.

21152154155513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62142187.

The product of its digits is 150000, while the sum is 41.

The spelling of 21152154155513 in words is "twenty-one trillion, one hundred fifty-two billion, one hundred fifty-four million, one hundred fifty-five thousand, five hundred thirteen".