20897597389321 has 9 divisors (see below), whose sum is σ = 20966434681933. Its totient is φ = 20828985411820.

The previous prime is 20897597389313. The next prime is 20897597389363. The reversal of 20897597389321 is 12398379579802.

The square root of 20897597389321 is 4571389.

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

It is not a de Polignac number, because 20897597389321 - 2³ = 20897597389313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20897597309321) 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, 1421694630 + ... + 1421709328.

Almost surely, 2^{20897597389321} is an apocalyptic number.

20897597389321 is the 4571389-th square number.

20897597389321 is the 2285695-th centered octagonal number.

It is an amenable number.

20897597389321 is a deficient number, since it is larger than the sum of its proper divisors (68837292612).

20897597389321 is an frugal number, since it uses more digits than its factorization.

20897597389321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30020 (or 15010 counting only the distinct ones).

The product of its (nonzero) digits is 411505920, while the sum is 73.

The spelling of 20897597389321 in words is "twenty trillion, eight hundred ninety-seven billion, five hundred ninety-seven million, three hundred eighty-nine thousand, three hundred twenty-one".