25532221 has 16 divisors (see below), whose sum is σ = 30498048. Its totient is φ = 21067200.

The previous prime is 25532161. The next prime is 25532281. The reversal of 25532221 is 12223552.

It is an interprime number because it is at equal distance from previous prime (25532161) and next prime (25532281).

It is not a de Polignac number, because 25532221 - 2¹³ = 25524029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25532192 and 25532201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25532281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7260 + ... + 10186.

It is an arithmetic number, because the mean of its divisors is an integer number (1906128).

Almost surely, 2^25532221 is an apocalyptic number.

It is an amenable number.

25532221 is a deficient number, since it is larger than the sum of its proper divisors (4965827).

25532221 is a wasteful number, since it uses less digits than its factorization.

25532221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3012.

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

The square root of 25532221 is about 5052.9418164075. The cubic root of 25532221 is about 294.4621858645.

Adding to 25532221 its reverse (12223552), we get a palindrome (37755773).

It can be divided in two parts, 2553 and 2221, that added together give a palindrome (4774).

The spelling of 25532221 in words is "twenty-five million, five hundred thirty-two thousand, two hundred twenty-one".