21664016226211 has 2 divisors, whose sum is σ = 21664016226212. Its totient is φ = 21664016226210.

The previous prime is 21664016226199. The next prime is 21664016226233. The reversal of 21664016226211 is 11262261046612.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21664016226211 is a prime.

It is not a weakly prime, because it can be changed into another prime (21664716226211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10832008113105 + 10832008113106.

It is an arithmetic number, because the mean of its divisors is an integer number (10832008113106).

Almost surely, 2^{21664016226211} is an apocalyptic number.

21664016226211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21664016226211 is an equidigital number, since it uses as much as digits as its factorization.

21664016226211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 40.

The spelling of 21664016226211 in words is "twenty-one trillion, six hundred sixty-four billion, sixteen million, two hundred twenty-six thousand, two hundred eleven".