20321202131 has 4 divisors (see below), whose sum is σ = 20329084200. Its totient is φ = 20313320064.

The previous prime is 20321202089. The next prime is 20321202137. The reversal of 20321202131 is 13120212302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13120212302 = 2 ⋅6560106151.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20321202131 is a prime.

It is a super-2 number, since 2×20321202131² (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 (20321202137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3937166 + ... + 3942323.

It is an arithmetic number, because the mean of its divisors is an integer number (5082271050).

Almost surely, 2^20321202131 is an apocalyptic number.

20321202131 is a deficient number, since it is larger than the sum of its proper divisors (7882069).

20321202131 is an equidigital number, since it uses as much as digits as its factorization.

20321202131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7882068.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20321202131 its reverse (13120212302), we get a palindrome (33441414433).

The spelling of 20321202131 in words is "twenty billion, three hundred twenty-one million, two hundred two thousand, one hundred thirty-one".