21300275525 has 6 divisors (see below), whose sum is σ = 26412341682. Its totient is φ = 17040220400.

The previous prime is 21300275467. The next prime is 21300275537. The reversal of 21300275525 is 52557200312.

It can be written as a sum of positive squares in 3 ways, for example, as 4491412324 + 16808863201 = 67018^2 + 129649^2 .

It is not a de Polignac number, because 21300275525 - 2⁶ = 21300275461 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21300275491 and 21300275500.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 426005486 + ... + 426005535.

It is an arithmetic number, because the mean of its divisors is an integer number (4402056947).

Almost surely, 2^21300275525 is an apocalyptic number.

21300275525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21300275525 is a deficient number, since it is larger than the sum of its proper divisors (5112066157).

21300275525 is an equidigital number, since it uses as much as digits as its factorization.

21300275525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852011031 (or 852011026 counting only the distinct ones).

The product of its (nonzero) digits is 21000, while the sum is 32.

Adding to 21300275525 its reverse (52557200312), we get a palindrome (73857475837).

The spelling of 21300275525 in words is "twenty-one billion, three hundred million, two hundred seventy-five thousand, five hundred twenty-five".