20421043283 has 2 divisors, whose sum is σ = 20421043284. Its totient is φ = 20421043282.

The previous prime is 20421043211. The next prime is 20421043319. The reversal of 20421043283 is 38234012402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20421043283 is a prime.

It is not a weakly prime, because it can be changed into another prime (20421043483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10210521641 + 10210521642.

It is an arithmetic number, because the mean of its divisors is an integer number (10210521642).

Almost surely, 2^20421043283 is an apocalyptic number.

20421043283 is a deficient number, since it is larger than the sum of its proper divisors (1).

20421043283 is an equidigital number, since it uses as much as digits as its factorization.

20421043283 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 20421043283 its reverse (38234012402), we get a palindrome (58655055685).

The spelling of 20421043283 in words is "twenty billion, four hundred twenty-one million, forty-three thousand, two hundred eighty-three".