25350221 has 4 divisors (see below), whose sum is σ = 27300252. Its totient is φ = 23400192.

The previous prime is 25350211. The next prime is 25350251. The reversal of 25350221 is 12205352.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2175625 + 23174596 = 1475^2 + 4814^2 .

It is a cyclic number.

It is not a de Polignac number, because 25350221 - 2²² = 21155917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25350193 and 25350202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25350211) 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, 974996 + ... + 975021.

It is an arithmetic number, because the mean of its divisors is an integer number (6825063).

Almost surely, 2^25350221 is an apocalyptic number.

It is an amenable number.

25350221 is a deficient number, since it is larger than the sum of its proper divisors (1950031).

25350221 is a wasteful number, since it uses less digits than its factorization.

25350221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1950030.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 25350221 is about 5034.9002969274. The cubic root of 25350221 is about 293.7608503009.

Adding to 25350221 its reverse (12205352), we get a palindrome (37555573).

The spelling of 25350221 in words is "twenty-five million, three hundred fifty thousand, two hundred twenty-one".