21066105233 has 2 divisors, whose sum is σ = 21066105234. Its totient is φ = 21066105232.

The previous prime is 21066105173. The next prime is 21066105241. The reversal of 21066105233 is 33250166012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11743623424 + 9322481809 = 108368^2 + 96553^2 .

It is a cyclic number.

It is not a de Polignac number, because 21066105233 - 2¹⁰ = 21066104209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21066105196 and 21066105205.

It is not a weakly prime, because it can be changed into another prime (21066104233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10533052616 + 10533052617.

It is an arithmetic number, because the mean of its divisors is an integer number (10533052617).

Almost surely, 2^21066105233 is an apocalyptic number.

It is an amenable number.

21066105233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21066105233 is an equidigital number, since it uses as much as digits as its factorization.

21066105233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 29.

The spelling of 21066105233 in words is "twenty-one billion, sixty-six million, one hundred five thousand, two hundred thirty-three".