1721104321201 has 4 divisors (see below), whose sum is σ = 1780452746100. Its totient is φ = 1661755896304.

The previous prime is 1721104321171. The next prime is 1721104321301. The reversal of 1721104321201 is 1021234011271.

It is a happy number.

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 960790079601 + 760314241600 = 980199^2 + 871960^2 .

It is a cyclic number.

It is not a de Polignac number, because 1721104321201 - 2¹⁵ = 1721104288433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1721104321301) 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, 29674212406 + ... + 29674212463.

It is an arithmetic number, because the mean of its divisors is an integer number (445113186525).

Almost surely, 2^{1721104321201} is an apocalyptic number.

It is an amenable number.

1721104321201 is a deficient number, since it is larger than the sum of its proper divisors (59348424899).

1721104321201 is an equidigital number, since it uses as much as digits as its factorization.

1721104321201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59348424898.

The product of its (nonzero) digits is 672, while the sum is 25.

Adding to 1721104321201 its reverse (1021234011271), we get a palindrome (2742338332472).

The spelling of 1721104321201 in words is "one trillion, seven hundred twenty-one billion, one hundred four million, three hundred twenty-one thousand, two hundred one".