20400232321 has 8 divisors (see below), whose sum is σ = 23335432640. Its totient is φ = 17470252368.

The previous prime is 20400232289. The next prime is 20400232343. The reversal of 20400232321 is 12323200402.

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

It is a cyclic number.

It is not a de Polignac number, because 20400232321 - 2⁵ = 20400232289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20400232121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1296711 + ... + 1312348.

It is an arithmetic number, because the mean of its divisors is an integer number (2916929080).

Almost surely, 2^20400232321 is an apocalyptic number.

It is an amenable number.

20400232321 is a deficient number, since it is larger than the sum of its proper divisors (2935200319).

20400232321 is a wasteful number, since it uses less digits than its factorization.

20400232321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2610183.

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 20400232321 its reverse (12323200402), we get a palindrome (32723432723).

The spelling of 20400232321 in words is "twenty billion, four hundred million, two hundred thirty-two thousand, three hundred twenty-one".