1721399104441 has 9 divisors (see below), whose sum is σ = 1734056077221. Its totient is φ = 1708833879324.

The previous prime is 1721399104423. The next prime is 1721399104463. The reversal of 1721399104441 is 1444019931271.

The square root of 1721399104441 is 1312021.

It is a perfect power (a square), and thus also a powerful number.

It is a de Polignac number, because none of the positive numbers 2^k-1721399104441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1721399104391 and 1721399104400.

It is not an unprimeable number, because it can be changed into a prime (1721399104421) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 182366200 + ... + 182375638.

It is an arithmetic number, because the mean of its divisors is an integer number (192672897469).

Almost surely, 2^{1721399104441} is an apocalyptic number.

1721399104441 is the 1312021-st square number.

1721399104441 is the 656011-st centered octagonal number.

It is an amenable number.

1721399104441 is a deficient number, since it is larger than the sum of its proper divisors (12656972780).

1721399104441 is an frugal number, since it uses more digits than its factorization.

1721399104441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19156 (or 9578 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 46.

The spelling of 1721399104441 in words is "one trillion, seven hundred twenty-one billion, three hundred ninety-nine million, one hundred four thousand, four hundred forty-one".