21203110273 has 2 divisors, whose sum is σ = 21203110274. Its totient is φ = 21203110272.

The previous prime is 21203110219. The next prime is 21203110289. The reversal of 21203110273 is 37201130212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18729838449 + 2473271824 = 136857^2 + 49732^2 .

It is a cyclic number.

It is not a de Polignac number, because 21203110273 - 2⁹ = 21203109761 is a prime.

It is not a weakly prime, because it can be changed into another prime (21203110213) 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, 10601555136 + 10601555137.

It is an arithmetic number, because the mean of its divisors is an integer number (10601555137).

Almost surely, 2^21203110273 is an apocalyptic number.

It is an amenable number.

21203110273 is a deficient number, since it is larger than the sum of its proper divisors (1).

21203110273 is an equidigital number, since it uses as much as digits as its factorization.

21203110273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 22.

Adding to 21203110273 its reverse (37201130212), we get a palindrome (58404240485).

The spelling of 21203110273 in words is "twenty-one billion, two hundred three million, one hundred ten thousand, two hundred seventy-three".