21220310203 has 2 divisors, whose sum is σ = 21220310204. Its totient is φ = 21220310202.

The previous prime is 21220310173. The next prime is 21220310207. The reversal of 21220310203 is 30201302212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21220310203 is a prime.

It is a super-2 number, since 2×21220310203² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21220310207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610155101 + 10610155102.

It is an arithmetic number, because the mean of its divisors is an integer number (10610155102).

Almost surely, 2^21220310203 is an apocalyptic number.

21220310203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220310203 is an equidigital number, since it uses as much as digits as its factorization.

21220310203 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 21220310203 its reverse (30201302212), we get a palindrome (51421612415).

The spelling of 21220310203 in words is "twenty-one billion, two hundred twenty million, three hundred ten thousand, two hundred three".