20321112131 has 4 divisors (see below), whose sum is σ = 20330440200. Its totient is φ = 20311784064.

The previous prime is 20321112113. The next prime is 20321112169. The reversal of 20321112131 is 13121112302.

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

It is a cyclic number.

It is not a de Polignac number, because 20321112131 - 2¹⁴ = 20321095747 is a prime.

It is a super-2 number, since 2×20321112131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20321112101) 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, 4660766 + ... + 4665123.

It is an arithmetic number, because the mean of its divisors is an integer number (5082610050).

Almost surely, 2^20321112131 is an apocalyptic number.

20321112131 is a deficient number, since it is larger than the sum of its proper divisors (9328069).

20321112131 is an equidigital number, since it uses as much as digits as its factorization.

20321112131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9328068.

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

Adding to 20321112131 its reverse (13121112302), we get a palindrome (33442224433).

The spelling of 20321112131 in words is "twenty billion, three hundred twenty-one million, one hundred twelve thousand, one hundred thirty-one".