20041421831 has 2 divisors, whose sum is σ = 20041421832. Its totient is φ = 20041421830.

The previous prime is 20041421809. The next prime is 20041421921. The reversal of 20041421831 is 13812414002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20041421831 - 2⁶ = 20041421767 is a prime.

It is a super-2 number, since 2×20041421831² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20041421831.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20041429831) 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 as a sum of consecutive naturals, namely, 10020710915 + 10020710916.

It is an arithmetic number, because the mean of its divisors is an integer number (10020710916).

Almost surely, 2^20041421831 is an apocalyptic number.

20041421831 is a deficient number, since it is larger than the sum of its proper divisors (1).

20041421831 is an equidigital number, since it uses as much as digits as its factorization.

20041421831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 26.

Adding to 20041421831 its reverse (13812414002), we get a palindrome (33853835833).

The spelling of 20041421831 in words is "twenty billion, forty-one million, four hundred twenty-one thousand, eight hundred thirty-one".