21003232325 has 6 divisors (see below), whose sum is σ = 26044008114. Its totient is φ = 16802585840.

The previous prime is 21003232277. The next prime is 21003232333. The reversal of 21003232325 is 52323230012.

It can be written as a sum of positive squares in 3 ways, for example, as 5304645889 + 15698586436 = 72833^2 + 125294^2 .

It is not a de Polignac number, because 21003232325 - 2²⁴ = 20986455109 is a prime.

It is a super-2 number, since 2×21003232325² (a number of 21 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 21003232325.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 420064622 + ... + 420064671.

It is an arithmetic number, because the mean of its divisors is an integer number (4340668019).

Almost surely, 2^21003232325 is an apocalyptic number.

21003232325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21003232325 is a deficient number, since it is larger than the sum of its proper divisors (5040775789).

21003232325 is an equidigital number, since it uses as much as digits as its factorization.

21003232325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840129303 (or 840129298 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 23.

Adding to 21003232325 its reverse (52323230012), we get a palindrome (73326462337).

The spelling of 21003232325 in words is "twenty-one billion, three million, two hundred thirty-two thousand, three hundred twenty-five".