21130303253 has 2 divisors, whose sum is σ = 21130303254. Its totient is φ = 21130303252.

The previous prime is 21130303219. The next prime is 21130303277. The reversal of 21130303253 is 35230303112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19245180529 + 1885122724 = 138727^2 + 43418^2 .

It is a cyclic number.

It is not a de Polignac number, because 21130303253 - 2⁶ = 21130303189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21130363253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565151626 + 10565151627.

It is an arithmetic number, because the mean of its divisors is an integer number (10565151627).

Almost surely, 2^21130303253 is an apocalyptic number.

It is an amenable number.

21130303253 is a deficient number, since it is larger than the sum of its proper divisors (1).

21130303253 is an equidigital number, since it uses as much as digits as its factorization.

21130303253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 23.

Adding to 21130303253 its reverse (35230303112), we get a palindrome (56360606365).

The spelling of 21130303253 in words is "twenty-one billion, one hundred thirty million, three hundred three thousand, two hundred fifty-three".