21253055025515 has 8 divisors (see below), whose sum is σ = 25631825157600. Its totient is φ = 16917004602432.

The previous prime is 21253055025469. The next prime is 21253055025619. The reversal of 21253055025515 is 51552055035212.

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 21253055025515 - 2¹⁶ = 21253054959979 is a prime.

It is a super-3 number, since 3×21253055025515³ (a number of 41 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10679926154 + ... + 10679928143.

It is an arithmetic number, because the mean of its divisors is an integer number (3203978144700).

Almost surely, 2^{21253055025515} is an apocalyptic number.

21253055025515 is a deficient number, since it is larger than the sum of its proper divisors (4378770132085).

21253055025515 is a wasteful number, since it uses less digits than its factorization.

21253055025515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21359854501.

The product of its (nonzero) digits is 375000, while the sum is 41.

The spelling of 21253055025515 in words is "twenty-one trillion, two hundred fifty-three billion, fifty-five million, twenty-five thousand, five hundred fifteen".