25220323221 has 8 divisors (see below), whose sum is σ = 33953574720. Its totient is φ = 16650310272.

The previous prime is 25220323217. The next prime is 25220323229. The reversal of 25220323221 is 12232302252.

It is a happy number.

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

It is not a de Polignac number, because 25220323221 - 2² = 25220323217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25220323191 and 25220323200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25220323229) 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, 40809276 + ... + 40809893.

It is an arithmetic number, because the mean of its divisors is an integer number (4244196840).

Almost surely, 2^25220323221 is an apocalyptic number.

It is an amenable number.

25220323221 is a deficient number, since it is larger than the sum of its proper divisors (8733251499).

25220323221 is a wasteful number, since it uses less digits than its factorization.

25220323221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81619275.

The product of its (nonzero) digits is 2880, while the sum is 24.

Adding to 25220323221 its reverse (12232302252), we get a palindrome (37452625473).

The spelling of 25220323221 in words is "twenty-five billion, two hundred twenty million, three hundred twenty-three thousand, two hundred twenty-one".