21504252114505 has 4 divisors (see below), whose sum is σ = 25805102537412. Its totient is φ = 17203401691600.

The previous prime is 21504252114491. The next prime is 21504252114559. The reversal of 21504252114505 is 50541125240512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13141901030976 + 8362351083529 = 3625176^2 + 2891773^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21504252114505 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2150425211446 + ... + 2150425211455.

It is an arithmetic number, because the mean of its divisors is an integer number (6451275634353).

Almost surely, 2^{21504252114505} is an apocalyptic number.

It is an amenable number.

21504252114505 is a deficient number, since it is larger than the sum of its proper divisors (4300850422907).

21504252114505 is an equidigital number, since it uses as much as digits as its factorization.

21504252114505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4300850422906.

The product of its (nonzero) digits is 80000, while the sum is 37.

The spelling of 21504252114505 in words is "twenty-one trillion, five hundred four billion, two hundred fifty-two million, one hundred fourteen thousand, five hundred five".