1721534521323 has 8 divisors (see below), whose sum is σ = 2297020096000. Its totient is φ = 1146869313768.

The previous prime is 1721534521321. The next prime is 1721534521373. The reversal of 1721534521323 is 3231254351271.

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

It is not a de Polignac number, because 1721534521323 - 2¹ = 1721534521321 is a prime.

It is a super-3 number, since 3×1721534521323³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1721534521321) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 205086883 + ... + 205095276.

It is an arithmetic number, because the mean of its divisors is an integer number (287127512000).

Almost surely, 2^{1721534521323} is an apocalyptic number.

1721534521323 is a deficient number, since it is larger than the sum of its proper divisors (575485574677).

1721534521323 is a wasteful number, since it uses less digits than its factorization.

1721534521323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410183561.

The product of its digits is 151200, while the sum is 39.

Adding to 1721534521323 its reverse (3231254351271), we get a palindrome (4952788872594).

The spelling of 1721534521323 in words is "one trillion, seven hundred twenty-one billion, five hundred thirty-four million, five hundred twenty-one thousand, three hundred twenty-three".