20125321 has 2 divisors, whose sum is σ = 20125322. Its totient is φ = 20125320.

The previous prime is 20125307. The next prime is 20125363. The reversal of 20125321 is 12352102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19927296 + 198025 = 4464^2 + 445^2 .

It is a cyclic number.

It is not a de Polignac number, because 20125321 - 2⁵ = 20125289 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20125295 and 20125304.

It is not a weakly prime, because it can be changed into another prime (20125381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10062660 + 10062661.

It is an arithmetic number, because the mean of its divisors is an integer number (10062661).

Almost surely, 2^20125321 is an apocalyptic number.

It is an amenable number.

20125321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20125321 is an equidigital number, since it uses as much as digits as its factorization.

20125321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 20125321 is about 4486.1253883502. The cubic root of 20125321 is about 272.0075374569.

Adding to 20125321 its reverse (12352102), we get a palindrome (32477423).

The spelling of 20125321 in words is "twenty million, one hundred twenty-five thousand, three hundred twenty-one".