20111231321 has 8 divisors (see below), whose sum is σ = 21177220320. Its totient is φ = 19045992672.

The previous prime is 20111231291. The next prime is 20111231339. The reversal of 20111231321 is 12313211102.

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

It is a cyclic number.

It is not a de Polignac number, because 20111231321 - 2²⁶ = 20044122457 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 20111231321.

It is not an unprimeable number, because it can be changed into a prime (20111231351) 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 7 ways as a sum of consecutive naturals, for example, 132140 + ... + 240173.

It is an arithmetic number, because the mean of its divisors is an integer number (2647152540).

Almost surely, 2^20111231321 is an apocalyptic number.

It is an amenable number.

20111231321 is a deficient number, since it is larger than the sum of its proper divisors (1065988999).

20111231321 is a wasteful number, since it uses less digits than its factorization.

20111231321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375175.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 20111231321 its reverse (12313211102), we get a palindrome (32424442423).

The spelling of 20111231321 in words is "twenty billion, one hundred eleven million, two hundred thirty-one thousand, three hundred twenty-one".