25221541 has 2 divisors, whose sum is σ = 25221542. Its totient is φ = 25221540.

The previous prime is 25221533. The next prime is 25221571. The reversal of 25221541 is 14512252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14032516 + 11189025 = 3746^2 + 3345^2 .

It is a cyclic number.

It is not a de Polignac number, because 25221541 - 2³ = 25221533 is a prime.

It is a super-2 number, since 2×25221541² = 1272252260829362, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25221571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12610770 + 12610771.

It is an arithmetic number, because the mean of its divisors is an integer number (12610771).

Almost surely, 2^25221541 is an apocalyptic number.

It is an amenable number.

25221541 is a deficient number, since it is larger than the sum of its proper divisors (1).

25221541 is an equidigital number, since it uses as much as digits as its factorization.

25221541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 800, while the sum is 22.

The square root of 25221541 is about 5022.1052358548. The cubic root of 25221541 is about 293.2629547352.

Adding to 25221541 its reverse (14512252), we get a palindrome (39733793).

The spelling of 25221541 in words is "twenty-five million, two hundred twenty-one thousand, five hundred forty-one".