25071421 has 2 divisors, whose sum is σ = 25071422. Its totient is φ = 25071420.

The previous prime is 25071419. The next prime is 25071443. The reversal of 25071421 is 12417052.

It is a happy number.

It is an a-pointer prime, because the next prime (25071443) can be obtained adding 25071421 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19263321 + 5808100 = 4389^2 + 2410^2 .

It is a cyclic number.

It is not a de Polignac number, because 25071421 - 2¹ = 25071419 is a prime.

Together with 25071419, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 25071392 and 25071401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25071521) 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, 12535710 + 12535711.

It is an arithmetic number, because the mean of its divisors is an integer number (12535711).

Almost surely, 2^25071421 is an apocalyptic number.

It is an amenable number.

25071421 is a deficient number, since it is larger than the sum of its proper divisors (1).

25071421 is an equidigital number, since it uses as much as digits as its factorization.

25071421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 25071421 is about 5007.1370063141. The cubic root of 25071421 is about 292.6799574417.

Adding to 25071421 its reverse (12417052), we get a palindrome (37488473).

The spelling of 25071421 in words is "twenty-five million, seventy-one thousand, four hundred twenty-one".