21304050203 has 2 divisors, whose sum is σ = 21304050204. Its totient is φ = 21304050202.

The previous prime is 21304050199. The next prime is 21304050331. The reversal of 21304050203 is 30205040312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21304050203 - 2² = 21304050199 is a prime.

It is not a weakly prime, because it can be changed into another prime (21304050503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10652025101 + 10652025102.

It is an arithmetic number, because the mean of its divisors is an integer number (10652025102).

Almost surely, 2^21304050203 is an apocalyptic number.

21304050203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21304050203 is an equidigital number, since it uses as much as digits as its factorization.

21304050203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 20.

Adding to 21304050203 its reverse (30205040312), we get a palindrome (51509090515).

The spelling of 21304050203 in words is "twenty-one billion, three hundred four million, fifty thousand, two hundred three".