21666114542206 has 8 divisors (see below), whose sum is σ = 32503073767920. Its totient is φ = 10831756619568.

The previous prime is 21666114542197. The next prime is 21666114542239. The reversal of 21666114542206 is 60224541166612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 650304946 + ... + 650338261.

It is an arithmetic number, because the mean of its divisors is an integer number (4062884220990).

Almost surely, 2^{21666114542206} is an apocalyptic number.

21666114542206 is a deficient number, since it is larger than the sum of its proper divisors (10836959225714).

21666114542206 is a wasteful number, since it uses less digits than its factorization.

21666114542206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1300651538.

The product of its (nonzero) digits is 829440, while the sum is 46.

The spelling of 21666114542206 in words is "twenty-one trillion, six hundred sixty-six billion, one hundred fourteen million, five hundred forty-two thousand, two hundred six".