20312002321 has 16 divisors (see below), whose sum is σ = 22392659520. Its totient is φ = 18305743680.

The previous prime is 20312002253. The next prime is 20312002349. The reversal of 20312002321 is 12320021302.

It is a cyclic number.

It is not a de Polignac number, because 20312002321 - 2¹¹ = 20312000273 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20312002295 and 20312002304.

It is not an unprimeable number, because it can be changed into a prime (20312000321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1619886 + ... + 1632376.

It is an arithmetic number, because the mean of its divisors is an integer number (1399541220).

Almost surely, 2^20312002321 is an apocalyptic number.

It is an amenable number.

20312002321 is a deficient number, since it is larger than the sum of its proper divisors (2080657199).

20312002321 is a wasteful number, since it uses less digits than its factorization.

20312002321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15456.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 20312002321 its reverse (12320021302), we get a palindrome (32632023623).

The spelling of 20312002321 in words is "twenty billion, three hundred twelve million, two thousand, three hundred twenty-one".