20013012321 has 4 divisors (see below), whose sum is σ = 26684016432. Its totient is φ = 13342008212.

The previous prime is 20013012311. The next prime is 20013012347. The reversal of 20013012321 is 12321031002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20013012321 - 2¹¹ = 20013010273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20013012321.

It is not an unprimeable number, because it can be changed into a prime (20013012311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3335502051 + ... + 3335502056.

It is an arithmetic number, because the mean of its divisors is an integer number (6671004108).

Almost surely, 2^20013012321 is an apocalyptic number.

It is an amenable number.

20013012321 is a deficient number, since it is larger than the sum of its proper divisors (6671004111).

20013012321 is an equidigital number, since it uses as much as digits as its factorization.

20013012321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6671004110.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 20013012321 its reverse (12321031002), we get a palindrome (32334043323).

The spelling of 20013012321 in words is "twenty billion, thirteen million, twelve thousand, three hundred twenty-one".