25221211 has 2 divisors, whose sum is σ = 25221212. Its totient is φ = 25221210.

The previous prime is 25221199. The next prime is 25221223. The reversal of 25221211 is 11212252.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (25221199) and next prime (25221223).

It is a cyclic number.

It is not a de Polignac number, because 25221211 - 2¹⁹ = 24696923 is a prime.

It is a super-2 number, since 2×25221211² = 1272218968613042, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25221241) 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, 12610605 + 12610606.

It is an arithmetic number, because the mean of its divisors is an integer number (12610606).

Almost surely, 2^25221211 is an apocalyptic number.

25221211 is a deficient number, since it is larger than the sum of its proper divisors (1).

25221211 is an equidigital number, since it uses as much as digits as its factorization.

25221211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80, while the sum is 16.

The square root of 25221211 is about 5022.0723809997. The cubic root of 25221211 is about 293.2616757069.

Adding to 25221211 its reverse (11212252), we get a palindrome (36433463).

The spelling of 25221211 in words is "twenty-five million, two hundred twenty-one thousand, two hundred eleven".