25220221 has 8 divisors (see below), whose sum is σ = 27415584. Its totient is φ = 23061360.

The previous prime is 25220191. The next prime is 25220257. The reversal of 25220221 is 12202252.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25220221 - 2¹¹ = 25218173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25220195 and 25220204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25220521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7675 + ... + 10456.

It is an arithmetic number, because the mean of its divisors is an integer number (3426948).

Almost surely, 2^25220221 is an apocalyptic number.

It is an amenable number.

25220221 is a deficient number, since it is larger than the sum of its proper divisors (2195363).

25220221 is a wasteful number, since it uses less digits than its factorization.

25220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18251.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 25220221 is about 5021.9738151448. The cubic root of 25220221 is about 293.2578385549.

Adding to 25220221 its reverse (12202252), we get a palindrome (37422473).

The spelling of 25220221 in words is "twenty-five million, two hundred twenty thousand, two hundred twenty-one".