21603271770425 has 6 divisors (see below), whose sum is σ = 26788056995358. Its totient is φ = 17282617416320.

The previous prime is 21603271770391. The next prime is 21603271770427. The reversal of 21603271770425 is 52407717230612.

It can be written as a sum of positive squares in 3 ways, for example, as 33452044201 + 21569819726224 = 182899^2 + 4644332^2 .

It is not a de Polignac number, because 21603271770425 - 2⁶ = 21603271770361 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21603271770425.

It is not an unprimeable number, because it can be changed into a prime (21603271770427) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 432065435384 + ... + 432065435433.

It is an arithmetic number, because the mean of its divisors is an integer number (4464676165893).

Almost surely, 2^{21603271770425} is an apocalyptic number.

21603271770425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21603271770425 is a deficient number, since it is larger than the sum of its proper divisors (5184785224933).

21603271770425 is an equidigital number, since it uses as much as digits as its factorization.

21603271770425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864130870827 (or 864130870822 counting only the distinct ones).

The product of its (nonzero) digits is 987840, while the sum is 47.

The spelling of 21603271770425 in words is "twenty-one trillion, six hundred three billion, two hundred seventy-one million, seven hundred seventy thousand, four hundred twenty-five".