20542421203 has 2 divisors, whose sum is σ = 20542421204. Its totient is φ = 20542421202.

The previous prime is 20542421147. The next prime is 20542421269. The reversal of 20542421203 is 30212424502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20542421203 - 2¹³ = 20542413011 is a prime.

It is not a weakly prime, because it can be changed into another prime (20542421293) 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, 10271210601 + 10271210602.

It is an arithmetic number, because the mean of its divisors is an integer number (10271210602).

Almost surely, 2^20542421203 is an apocalyptic number.

20542421203 is a deficient number, since it is larger than the sum of its proper divisors (1).

20542421203 is an equidigital number, since it uses as much as digits as its factorization.

20542421203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 20542421203 its reverse (30212424502), we get a palindrome (50754845705).

The spelling of 20542421203 in words is "twenty billion, five hundred forty-two million, four hundred twenty-one thousand, two hundred three".