25016021 has 2 divisors, whose sum is σ = 25016022. Its totient is φ = 25016020.

The previous prime is 25016011. The next prime is 25016023. The reversal of 25016021 is 12061052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16313521 + 8702500 = 4039^2 + 2950^2 .

It is a cyclic number.

It is not a de Polignac number, because 25016021 - 2⁶ = 25015957 is a prime.

Together with 25016023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25016023) 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, 12508010 + 12508011.

It is an arithmetic number, because the mean of its divisors is an integer number (12508011).

Almost surely, 2^25016021 is an apocalyptic number.

It is an amenable number.

25016021 is a deficient number, since it is larger than the sum of its proper divisors (1).

25016021 is an equidigital number, since it uses as much as digits as its factorization.

25016021 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 17.

The square root of 25016021 is about 5001.6018434098. The cubic root of 25016021 is about 292.4642214011.

Adding to 25016021 its reverse (12061052), we get a palindrome (37077073).

The spelling of 25016021 in words is "twenty-five million, sixteen thousand, twenty-one".