25000221 has 4 divisors (see below), whose sum is σ = 33333632. Its totient is φ = 16666812.

The previous prime is 25000211. The next prime is 25000231. The reversal of 25000221 is 12200052.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (25000211) and next prime (25000231).

It is not a de Polignac number, because 25000221 - 2¹¹ = 24998173 is a prime.

It is a super-2 number, since 2×25000221² = 1250022100097682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25000197 and 25000206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25000211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4166701 + ... + 4166706.

It is an arithmetic number, because the mean of its divisors is an integer number (8333408).

Almost surely, 2^25000221 is an apocalyptic number.

It is an amenable number.

25000221 is a deficient number, since it is larger than the sum of its proper divisors (8333411).

25000221 is an equidigital number, since it uses as much as digits as its factorization.

25000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8333410.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 25000221 is about 5000.0220999512. The cubic root of 25000221 is about 292.4026354293.

Adding to 25000221 its reverse (12200052), we get a palindrome (37200273).

The spelling of 25000221 in words is "twenty-five million, two hundred twenty-one", and thus it is an aban number.