221213591552 has 108 divisors (see below), whose sum is σ = 467679372615. Its totient is φ = 104593821696.

The previous prime is 221213591531. The next prime is 221213591593. The reversal of 221213591552 is 255195312122.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

221213591552 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 110606795776 + 110606795776 = 332576^2 + 332576^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=332576.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 404412143 + ... + 404412689.

Almost surely, 2^221213591552 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 221213591552

221213591552 is an abundant number, since it is smaller than the sum of its proper divisors (246465781063).

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

221213591552 is an frugal number, since it uses more digits than its factorization.

221213591552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1154 (or 568 counting only the distinct ones).

The product of its digits is 54000, while the sum is 38.

The spelling of 221213591552 in words is "two hundred twenty-one billion, two hundred thirteen million, five hundred ninety-one thousand, five hundred fifty-two".