21301220203 has 2 divisors, whose sum is σ = 21301220204. Its totient is φ = 21301220202.

The previous prime is 21301220117. The next prime is 21301220209. The reversal of 21301220203 is 30202210312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21301220203 is a prime.

It is a super-2 number, since 2×21301220203² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21301220209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650610101 + 10650610102.

It is an arithmetic number, because the mean of its divisors is an integer number (10650610102).

Almost surely, 2^21301220203 is an apocalyptic number.

21301220203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21301220203 is an equidigital number, since it uses as much as digits as its factorization.

21301220203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21301220203 its reverse (30202210312), we get a palindrome (51503430515).

The spelling of 21301220203 in words is "twenty-one billion, three hundred one million, two hundred twenty thousand, two hundred three".