20031213011321 has 4 divisors (see below), whose sum is σ = 20721944494500. Its totient is φ = 19340481528144.

The previous prime is 20031213011221. The next prime is 20031213011347. The reversal of 20031213011321 is 12311031213002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13316952577600 + 6714260433721 = 3649240^2 + 2591189^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20031213011321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20031213011293 and 20031213011302.

It is not an unprimeable number, because it can be changed into a prime (20031213011221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345365741546 + ... + 345365741603.

It is an arithmetic number, because the mean of its divisors is an integer number (5180486123625).

Almost surely, 2^{20031213011321} is an apocalyptic number.

It is an amenable number.

20031213011321 is a deficient number, since it is larger than the sum of its proper divisors (690731483179).

20031213011321 is an equidigital number, since it uses as much as digits as its factorization.

20031213011321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690731483178.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 20031213011321 its reverse (12311031213002), we get a palindrome (32342244224323).

The spelling of 20031213011321 in words is "twenty trillion, thirty-one billion, two hundred thirteen million, eleven thousand, three hundred twenty-one".