21635304226273 has 2 divisors, whose sum is σ = 21635304226274. Its totient is φ = 21635304226272.

The previous prime is 21635304226231. The next prime is 21635304226343. The reversal of 21635304226273 is 37262240353612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20555269899264 + 1080034327009 = 4533792^2 + 1039247^2 .

It is a cyclic number.

It is not a de Polignac number, because 21635304226273 - 2⁴¹ = 19436280970721 is a prime.

It is not a weakly prime, because it can be changed into another prime (21635304226223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10817652113136 + 10817652113137.

It is an arithmetic number, because the mean of its divisors is an integer number (10817652113137).

Almost surely, 2^{21635304226273} is an apocalyptic number.

It is an amenable number.

21635304226273 is a deficient number, since it is larger than the sum of its proper divisors (1).

21635304226273 is an equidigital number, since it uses as much as digits as its factorization.

21635304226273 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2177280, while the sum is 46.

Adding to 21635304226273 its reverse (37262240353612), we get a palindrome (58897544579885).

The spelling of 21635304226273 in words is "twenty-one trillion, six hundred thirty-five billion, three hundred four million, two hundred twenty-six thousand, two hundred seventy-three".