25444421 has 2 divisors, whose sum is σ = 25444422. Its totient is φ = 25444420.

The previous prime is 25444409. The next prime is 25444423. The reversal of 25444421 is 12444452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25391521 + 52900 = 5039^2 + 230^2 .

It is a cyclic number.

It is not a de Polignac number, because 25444421 - 2⁶ = 25444357 is a prime.

Together with 25444423, 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 (25444423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12722210 + 12722211.

It is an arithmetic number, because the mean of its divisors is an integer number (12722211).

Almost surely, 2^25444421 is an apocalyptic number.

It is an amenable number.

25444421 is a deficient number, since it is larger than the sum of its proper divisors (1).

25444421 is an equidigital number, since it uses as much as digits as its factorization.

25444421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5120, while the sum is 26.

The square root of 25444421 is about 5044.2463262612. The cubic root of 25444421 is about 294.1242668102.

Adding to 25444421 its reverse (12444452), we get a palindrome (37888873).

The spelling of 25444421 in words is "twenty-five million, four hundred forty-four thousand, four hundred twenty-one".