21324550265 has 8 divisors (see below), whose sum is σ = 26072280648. Its totient is φ = 16737760000.

The previous prime is 21324550241. The next prime is 21324550279. The reversal of 21324550265 is 56205542312.

It can be written as a sum of positive squares in 4 ways, for example, as 9980809216 + 11343741049 = 99904^2 + 106507^2 .

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

It is not a de Polignac number, because 21324550265 - 2¹⁰ = 21324549241 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40234736 + ... + 40235265.

It is an arithmetic number, because the mean of its divisors is an integer number (3259035081).

Almost surely, 2^21324550265 is an apocalyptic number.

It is an amenable number.

21324550265 is a deficient number, since it is larger than the sum of its proper divisors (4747730383).

21324550265 is an equidigital number, since it uses as much as digits as its factorization.

21324550265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80470059.

The product of its (nonzero) digits is 72000, while the sum is 35.

The spelling of 21324550265 in words is "twenty-one billion, three hundred twenty-four million, five hundred fifty thousand, two hundred sixty-five".