20304321213 has 16 divisors (see below), whose sum is σ = 29546683200. Its totient is φ = 12300180480.

The previous prime is 20304321209. The next prime is 20304321217. The reversal of 20304321213 is 31212340302.

It is an interprime number because it is at equal distance from previous prime (20304321209) and next prime (20304321217).

It is not a de Polignac number, because 20304321213 - 2² = 20304321209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20304321213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20304321217) 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, 60708 + ... + 210461.

It is an arithmetic number, because the mean of its divisors is an integer number (1846667700).

Almost surely, 2^20304321213 is an apocalyptic number.

It is an amenable number.

20304321213 is a deficient number, since it is larger than the sum of its proper divisors (9242361987).

20304321213 is a wasteful number, since it uses less digits than its factorization.

20304321213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273452.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 20304321213 its reverse (31212340302), we get a palindrome (51516661515).

The spelling of 20304321213 in words is "twenty billion, three hundred four million, three hundred twenty-one thousand, two hundred thirteen".