225311445244221 has 64 divisors (see below), whose sum is σ = 360849575116800. Its totient is φ = 122261217160896.

The previous prime is 225311445244211. The next prime is 225311445244247. The reversal of 225311445244221 is 122442544113522.

It is not a de Polignac number, because 225311445244221 - 2¹¹ = 225311445242173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225311445244201) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2915519860 + ... + 2915597138.

It is an arithmetic number, because the mean of its divisors is an integer number (5638274611200).

Almost surely, 2^{225311445244221} is an apocalyptic number.

225311445244221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

225311445244221 is a deficient number, since it is larger than the sum of its proper divisors (135538129872579).

225311445244221 is a wasteful number, since it uses less digits than its factorization.

225311445244221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120878.

The product of its digits is 614400, while the sum is 42.

Adding to 225311445244221 its reverse (122442544113522), we get a palindrome (347753989357743).

The spelling of 225311445244221 in words is "two hundred twenty-five trillion, three hundred eleven billion, four hundred forty-five million, two hundred forty-four thousand, two hundred twenty-one".