221535110225 has 24 divisors (see below), whose sum is σ = 322728635712. Its totient is φ = 148722868800.

The previous prime is 221535110221. The next prime is 221535110231. The reversal of 221535110225 is 522011535122.

It is a happy number.

It is not a de Polignac number, because 221535110225 - 2² = 221535110221 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221535110221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30980357 + ... + 30987506.

It is an arithmetic number, because the mean of its divisors is an integer number (13447026488).

Almost surely, 2^221535110225 is an apocalyptic number.

221535110225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221535110225 is a deficient number, since it is larger than the sum of its proper divisors (101193525487).

221535110225 is a wasteful number, since it uses less digits than its factorization.

221535110225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61967897 (or 61967892 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 29.

Adding to 221535110225 its reverse (522011535122), we get a palindrome (743546645347).

The spelling of 221535110225 in words is "two hundred twenty-one billion, five hundred thirty-five million, one hundred ten thousand, two hundred twenty-five".