221524272005172 has 96 divisors (see below), whose sum is σ = 555083450957952. Its totient is φ = 68509832933376.

The previous prime is 221524272005159. The next prime is 221524272005173. The reversal of 221524272005172 is 271500272425122.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221524272005173) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24498838 + ... + 32299250.

It is an arithmetic number, because the mean of its divisors is an integer number (5782119280812).

Almost surely, 2^{221524272005172} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221524272005172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (277541725478976).

221524272005172 is an abundant number, since it is smaller than the sum of its proper divisors (333559178952780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221524272005172 is a wasteful number, since it uses less digits than its factorization.

221524272005172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7802417 (or 7802415 counting only the distinct ones).

The product of its (nonzero) digits is 313600, while the sum is 42.

The spelling of 221524272005172 in words is "two hundred twenty-one trillion, five hundred twenty-four billion, two hundred seventy-two million, five thousand, one hundred seventy-two".