225012721171 has 4 divisors (see below), whose sum is σ = 257157395632. Its totient is φ = 192868046712.

The previous prime is 225012721169. The next prime is 225012721207. The reversal of 225012721171 is 171127210522.

225012721171 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 171127210522 = 2 ⋅85563605261.

It is a cyclic number.

It is not a de Polignac number, because 225012721171 - 2¹ = 225012721169 is a prime.

It is a super-2 number, since 2×225012721171² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225012721771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16072337220 + ... + 16072337233.

It is an arithmetic number, because the mean of its divisors is an integer number (64289348908).

Almost surely, 2^225012721171 is an apocalyptic number.

225012721171 is a deficient number, since it is larger than the sum of its proper divisors (32144674461).

225012721171 is an equidigital number, since it uses as much as digits as its factorization.

225012721171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32144674460.

The product of its (nonzero) digits is 3920, while the sum is 31.

Adding to 225012721171 its reverse (171127210522), we get a palindrome (396139931693).

The spelling of 225012721171 in words is "two hundred twenty-five billion, twelve million, seven hundred twenty-one thousand, one hundred seventy-one".