20423120340321 has 24 divisors (see below), whose sum is σ = 30805192978560. Its totient is φ = 13013911855296.

The previous prime is 20423120340313. The next prime is 20423120340361. The reversal of 20423120340321 is 12304302132402.

20423120340321 is a `hidden beast` number, since 2 + 0 + 4 + 2 + 31 + 203 + 403 + 21 = 666.

It is not a de Polignac number, because 20423120340321 - 2³ = 20423120340313 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20423120340361) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35804236 + ... + 36370173.

It is an arithmetic number, because the mean of its divisors is an integer number (1283549707440).

Almost surely, 2^{20423120340321} is an apocalyptic number.

It is an amenable number.

20423120340321 is a deficient number, since it is larger than the sum of its proper divisors (10382072638239).

20423120340321 is a wasteful number, since it uses less digits than its factorization.

20423120340321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72175805 (or 72175802 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 20423120340321 its reverse (12304302132402), we get a palindrome (32727422472723).

The spelling of 20423120340321 in words is "twenty trillion, four hundred twenty-three billion, one hundred twenty million, three hundred forty thousand, three hundred twenty-one".