25120221 has 8 divisors (see below), whose sum is σ = 38278464. Its totient is φ = 14354400.

The previous prime is 25120217. The next prime is 25120229. The reversal of 25120221 is 12202152.

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

It is not a de Polignac number, because 25120221 - 2² = 25120217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25120221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25120229) 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, 598080 + ... + 598121.

It is an arithmetic number, because the mean of its divisors is an integer number (4784808).

Almost surely, 2^25120221 is an apocalyptic number.

25120221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25120221 is a deficient number, since it is larger than the sum of its proper divisors (13158243).

25120221 is a wasteful number, since it uses less digits than its factorization.

25120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1196211.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 25120221 is about 5012.0076815584. The cubic root of 25120221 is about 292.8697289625.

Adding to 25120221 its reverse (12202152), we get a palindrome (37322373).

The spelling of 25120221 in words is "twenty-five million, one hundred twenty thousand, two hundred twenty-one".