20321012321 has 8 divisors (see below), whose sum is σ = 20518846560. Its totient is φ = 20123324928.

The previous prime is 20321012293. The next prime is 20321012323. The reversal of 20321012321 is 12321012302.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20321012321 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20321012321.

It is not an unprimeable number, because it can be changed into a prime (20321012323) 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, 252410 + ... + 323036.

It is an arithmetic number, because the mean of its divisors is an integer number (2564855820).

Almost surely, 2^20321012321 is an apocalyptic number.

It is an amenable number.

20321012321 is a deficient number, since it is larger than the sum of its proper divisors (197834239).

20321012321 is a wasteful number, since it uses less digits than its factorization.

20321012321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73423.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20321012321 its reverse (12321012302), we get a palindrome (32642024623).

The spelling of 20321012321 in words is "twenty billion, three hundred twenty-one million, twelve thousand, three hundred twenty-one".