25006016221 has 4 divisors (see below), whose sum is σ = 25020736000. Its totient is φ = 24991296444.

The previous prime is 25006016213. The next prime is 25006016239. The reversal of 25006016221 is 12261060052.

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 a cyclic number.

It is not a de Polignac number, because 25006016221 - 2³ = 25006016213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25006016201) 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, 7357341 + ... + 7360738.

It is an arithmetic number, because the mean of its divisors is an integer number (6255184000).

Almost surely, 2^25006016221 is an apocalyptic number.

It is an amenable number.

25006016221 is a deficient number, since it is larger than the sum of its proper divisors (14719779).

25006016221 is a wasteful number, since it uses less digits than its factorization.

25006016221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14719778.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 25006016221 its reverse (12261060052), we get a palindrome (37267076273).

The spelling of 25006016221 in words is "twenty-five billion, six million, sixteen thousand, two hundred twenty-one".