25121 has 2 divisors, whose sum is σ = 25122. Its totient is φ = 25120.

The previous prime is 25117. The next prime is 25127. The reversal of 25121 is 12152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21025 + 4096 = 145^2 + 64^2 .

It is a cyclic number.

It is not a de Polignac number, because 25121 - 2² = 25117 is a prime.

It is a nialpdrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 25121.

It is not a weakly prime, because it can be changed into another prime (25127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12560 + 12561.

It is an arithmetic number, because the mean of its divisors is an integer number (12561).

2²⁵¹²¹ is an apocalyptic number.

It is an amenable number.

25121 is a deficient number, since it is larger than the sum of its proper divisors (1).

25121 is an equidigital number, since it uses as much as digits as its factorization.

25121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20, while the sum is 11.

The square root of 25121 is about 158.4960567333. The cubic root of 25121 is about 29.2872756313.

Adding to 25121 its reverse (12152), we get a palindrome (37273).

It can be divided in two parts, 251 and 21, that added together give a palindrome (272).

The spelling of 25121 in words is "twenty-five thousand, one hundred twenty-one".