221604342060401 has 4 divisors (see below), whose sum is σ = 227593648602612. Its totient is φ = 215615035518192.

The previous prime is 221604342060383. The next prime is 221604342060421. The reversal of 221604342060401 is 104060243406122.

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 109537135068001 + 112067206992400 = 10465999^2 + 10586180^2 .

It is a cyclic number.

It is not a de Polignac number, because 221604342060401 - 2³⁴ = 221587162191217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221604342060421) 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, 2994653271050 + ... + 2994653271123.

It is an arithmetic number, because the mean of its divisors is an integer number (56898412150653).

Almost surely, 2^{221604342060401} is an apocalyptic number.

It is an amenable number.

221604342060401 is a deficient number, since it is larger than the sum of its proper divisors (5989306542211).

221604342060401 is an equidigital number, since it uses as much as digits as its factorization.

221604342060401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5989306542210.

The product of its (nonzero) digits is 55296, while the sum is 35.

Adding to 221604342060401 its reverse (104060243406122), we get a palindrome (325664585466523).

The spelling of 221604342060401 in words is "two hundred twenty-one trillion, six hundred four billion, three hundred forty-two million, sixty thousand, four hundred one".