221543165350345 has 4 divisors (see below), whose sum is σ = 265851798420420. Its totient is φ = 177234532280272.

The previous prime is 221543165350237. The next prime is 221543165350357. The reversal of 221543165350345 is 543053561345122.

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 138476856929161 + 83066308421184 = 11767619^2 + 9114072^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221543165350345 is a prime.

It is a super-2 number, since 2×221543165350345² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22154316535030 + ... + 22154316535039.

It is an arithmetic number, because the mean of its divisors is an integer number (66462949605105).

Almost surely, 2^{221543165350345} is an apocalyptic number.

It is an amenable number.

221543165350345 is a deficient number, since it is larger than the sum of its proper divisors (44308633070075).

221543165350345 is an equidigital number, since it uses as much as digits as its factorization.

221543165350345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44308633070074.

The product of its (nonzero) digits is 6480000, while the sum is 49.

The spelling of 221543165350345 in words is "two hundred twenty-one trillion, five hundred forty-three billion, one hundred sixty-five million, three hundred fifty thousand, three hundred forty-five".