21355318092233 has 2 divisors, whose sum is σ = 21355318092234. Its totient is φ = 21355318092232.

The previous prime is 21355318092217. The next prime is 21355318092343. The reversal of 21355318092233 is 33229081355312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20068357171984 + 1286960920249 = 4479772^2 + 1134443^2 .

It is a cyclic number.

It is not a de Polignac number, because 21355318092233 - 2⁴ = 21355318092217 is a prime.

It is a super-2 number, since 2×21355318092233² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21355318092533) 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, 10677659046116 + 10677659046117.

It is an arithmetic number, because the mean of its divisors is an integer number (10677659046117).

Almost surely, 2^{21355318092233} is an apocalyptic number.

It is an amenable number.

21355318092233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21355318092233 is an equidigital number, since it uses as much as digits as its factorization.

21355318092233 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1166400, while the sum is 47.

The spelling of 21355318092233 in words is "twenty-one trillion, three hundred fifty-five billion, three hundred eighteen million, ninety-two thousand, two hundred thirty-three".