221543757044213 has 4 divisors (see below), whose sum is σ = 221616705271500. Its totient is φ = 221470808816928.

The previous prime is 221543757044191. The next prime is 221543757044219. The reversal of 221543757044213 is 312440757345122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 186882078112324 + 34661678931889 = 13670482^2 + 5887417^2 .

It is a cyclic number.

It is not a de Polignac number, because 221543757044213 - 2³⁰ = 221542683302389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221543757044219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36474109088 + ... + 36474115161.

It is an arithmetic number, because the mean of its divisors is an integer number (55404176317875).

Almost surely, 2^{221543757044213} is an apocalyptic number.

It is an amenable number.

221543757044213 is a deficient number, since it is larger than the sum of its proper divisors (72948227287).

221543757044213 is an equidigital number, since it uses as much as digits as its factorization.

221543757044213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72948227286.

The product of its (nonzero) digits is 5644800, while the sum is 50.

The spelling of 221543757044213 in words is "two hundred twenty-one trillion, five hundred forty-three billion, seven hundred fifty-seven million, forty-four thousand, two hundred thirteen".