25221235 has 16 divisors (see below), whose sum is σ = 33477696. Its totient is φ = 18119808.

The previous prime is 25221223. The next prime is 25221239. The reversal of 25221235 is 53212252.

It is a cyclic number.

It is not a de Polignac number, because 25221235 - 2¹⁵ = 25188467 is a prime.

It is a super-2 number, since 2×25221235² = 1272221389850450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25221239) 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 in 15 ways as a sum of consecutive naturals, for example, 2839 + ... + 7648.

It is an arithmetic number, because the mean of its divisors is an integer number (2092356).

Almost surely, 2^25221235 is an apocalyptic number.

25221235 is a deficient number, since it is larger than the sum of its proper divisors (8256461).

25221235 is a wasteful number, since it uses less digits than its factorization.

25221235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10542.

The product of its digits is 1200, while the sum is 22.

The square root of 25221235 is about 5022.0747704510. The cubic root of 25221235 is about 293.2617687275.

Adding to 25221235 its reverse (53212252), we get a palindrome (78433487).

The spelling of 25221235 in words is "twenty-five million, two hundred twenty-one thousand, two hundred thirty-five".