25221611 has 2 divisors, whose sum is σ = 25221612. Its totient is φ = 25221610.

The previous prime is 25221589. The next prime is 25221613. The reversal of 25221611 is 11612252.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25221611 is a prime.

It is a super-2 number, since 2×25221611² = 1272259322870642, which contains 22 as substring.

Together with 25221613, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25221613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12610805 + 12610806.

It is an arithmetic number, because the mean of its divisors is an integer number (12610806).

Almost surely, 2^25221611 is an apocalyptic number.

25221611 is a deficient number, since it is larger than the sum of its proper divisors (1).

25221611 is an equidigital number, since it uses as much as digits as its factorization.

25221611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 240, while the sum is 20.

The square root of 25221611 is about 5022.1122050388. The cubic root of 25221611 is about 293.2632260428.

Adding to 25221611 its reverse (11612252), we get a palindrome (36833863).

The spelling of 25221611 in words is "twenty-five million, two hundred twenty-one thousand, six hundred eleven".