25124321 has 2 divisors, whose sum is σ = 25124322. Its totient is φ = 25124320.

The previous prime is 25124299. The next prime is 25124339. The reversal of 25124321 is 12342152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24641296 + 483025 = 4964^2 + 695^2 .

It is a cyclic number.

It is not a de Polignac number, because 25124321 - 2¹⁴ = 25107937 is a prime.

It is a super-2 number, since 2×25124321² = 1262463011422082, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25124293 and 25124302.

It is not a weakly prime, because it can be changed into another prime (25124381) by changing a digit.

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 as a sum of consecutive naturals, namely, 12562160 + 12562161.

It is an arithmetic number, because the mean of its divisors is an integer number (12562161).

Almost surely, 2^25124321 is an apocalyptic number.

It is an amenable number.

25124321 is a deficient number, since it is larger than the sum of its proper divisors (1).

25124321 is an equidigital number, since it uses as much as digits as its factorization.

25124321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 480, while the sum is 20.

The square root of 25124321 is about 5012.4166825993. The cubic root of 25124321 is about 292.8856616855.

Adding to 25124321 its reverse (12342152), we get a palindrome (37466473).

The spelling of 25124321 in words is "twenty-five million, one hundred twenty-four thousand, three hundred twenty-one".