21166016310266 has 128 divisors (see below), whose sum is σ = 34228219576320. Its totient is φ = 9801296524800.

The previous prime is 21166016310251. The next prime is 21166016310287. The reversal of 21166016310266 is 66201361066112.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5148627551 + ... + 5148631661.

It is an arithmetic number, because the mean of its divisors is an integer number (267407965440).

Almost surely, 2^{21166016310266} is an apocalyptic number.

21166016310266 is a deficient number, since it is larger than the sum of its proper divisors (13062203266054).

21166016310266 is a wasteful number, since it uses less digits than its factorization.

21166016310266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4540.

The product of its (nonzero) digits is 93312, while the sum is 41.

Adding to 21166016310266 its reverse (66201361066112), we get a palindrome (87367377376378).

The spelling of 21166016310266 in words is "twenty-one trillion, one hundred sixty-six billion, sixteen million, three hundred ten thousand, two hundred sixty-six".