21666346624111 has 8 divisors (see below), whose sum is σ = 24885968844800. Its totient is φ = 18477831864888.

The previous prime is 21666346624103. The next prime is 21666346624163. The reversal of 21666346624111 is 11142664366612.

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

It is a cyclic number.

It is not a de Polignac number, because 21666346624111 - 2³ = 21666346624103 is a prime.

It is a super-2 number, since 2×21666346624111² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21666346624211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7776863871 + ... + 7776866656.

It is an arithmetic number, because the mean of its divisors is an integer number (3110746105600).

Almost surely, 2^{21666346624111} is an apocalyptic number.

21666346624111 is a deficient number, since it is larger than the sum of its proper divisors (3219622220689).

21666346624111 is a wasteful number, since it uses less digits than its factorization.

21666346624111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15553730733.

The product of its digits is 1492992, while the sum is 49.

The spelling of 21666346624111 in words is "twenty-one trillion, six hundred sixty-six billion, three hundred forty-six million, six hundred twenty-four thousand, one hundred eleven".