21166126982366 has 16 divisors (see below), whose sum is σ = 31779695001600. Its totient is φ = 10572895716408.

The previous prime is 21166126982279. The next prime is 21166126982389. The reversal of 21166126982366 is 66328962166112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211952675 + ... + 212052513.

It is an arithmetic number, because the mean of its divisors is an integer number (1986230937600).

Almost surely, 2^{21166126982366} is an apocalyptic number.

21166126982366 is a deficient number, since it is larger than the sum of its proper divisors (10613568019234).

21166126982366 is a wasteful number, since it uses less digits than its factorization.

21166126982366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200623.

The product of its digits is 13436928, while the sum is 59.

The spelling of 21166126982366 in words is "twenty-one trillion, one hundred sixty-six billion, one hundred twenty-six million, nine hundred eighty-two thousand, three hundred sixty-six".