21650025275705 has 4 divisors (see below), whose sum is σ = 25980030330852. Its totient is φ = 17320020220560.

The previous prime is 21650025275663. The next prime is 21650025275717. The reversal of 21650025275705 is 50757252005612.

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 6853447532281 + 14796577743424 = 2617909^2 + 3846632^2 .

It is not a de Polignac number, because 21650025275705 - 2²⁶ = 21649958166841 is a prime.

It is a super-2 number, since 2×21650025275705² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21650025275705.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2165002527566 + ... + 2165002527575.

It is an arithmetic number, because the mean of its divisors is an integer number (6495007582713).

Almost surely, 2^{21650025275705} is an apocalyptic number.

It is an amenable number.

21650025275705 is a deficient number, since it is larger than the sum of its proper divisors (4330005055147).

21650025275705 is an equidigital number, since it uses as much as digits as its factorization.

21650025275705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4330005055146.

The product of its (nonzero) digits is 1470000, while the sum is 47.

The spelling of 21650025275705 in words is "twenty-one trillion, six hundred fifty billion, twenty-five million, two hundred seventy-five thousand, seven hundred five".