221003604161 has 8 divisors (see below), whose sum is σ = 221325482664. Its totient is φ = 220681820160.

The previous prime is 221003604131. The next prime is 221003604191. The reversal of 221003604161 is 161406300122.

221003604161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (221003604131) and next prime (221003604191).

It can be written as a sum of positive squares in 4 ways, for example, as 15290559025 + 205713045136 = 123655^2 + 453556^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221003604161 - 2²² = 220999409857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221003604161.

It is not an unprimeable number, because it can be changed into a prime (221003604131) 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 7 ways as a sum of consecutive naturals, for example, 5620991 + ... + 5660171.

It is an arithmetic number, because the mean of its divisors is an integer number (27665685333).

Almost surely, 2^221003604161 is an apocalyptic number.

It is an amenable number.

221003604161 is a deficient number, since it is larger than the sum of its proper divisors (321878503).

221003604161 is an equidigital number, since it uses as much as digits as its factorization.

221003604161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47251.

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 221003604161 its reverse (161406300122), we get a palindrome (382409904283).

The spelling of 221003604161 in words is "two hundred twenty-one billion, three million, six hundred four thousand, one hundred sixty-one".