21635304226223 has 2 divisors, whose sum is σ = 21635304226224. Its totient is φ = 21635304226222.

The previous prime is 21635304226201. The next prime is 21635304226231. The reversal of 21635304226223 is 32262240353612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21635304226223 - 2¹⁴ = 21635304209839 is a prime.

It is a super-2 number, since 2×21635304226223² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21635304226273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10817652113111 + 10817652113112.

It is an arithmetic number, because the mean of its divisors is an integer number (10817652113112).

Almost surely, 2^{21635304226223} is an apocalyptic number.

21635304226223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21635304226223 is an equidigital number, since it uses as much as digits as its factorization.

21635304226223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 41.

Adding to 21635304226223 its reverse (32262240353612), we get a palindrome (53897544579835).

The spelling of 21635304226223 in words is "twenty-one trillion, six hundred thirty-five billion, three hundred four million, two hundred twenty-six thousand, two hundred twenty-three".