21491176892066 has 8 divisors (see below), whose sum is σ = 36842017529280. Its totient is φ = 9210504382308.

The previous prime is 21491176892063. The next prime is 21491176892113. The reversal of 21491176892066 is 66029867119412.

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

It is not an unprimeable number, because it can be changed into a prime (21491176892063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 767542031846 + ... + 767542031873.

It is an arithmetic number, because the mean of its divisors is an integer number (4605252191160).

Almost surely, 2^{21491176892066} is an apocalyptic number.

21491176892066 is a deficient number, since it is larger than the sum of its proper divisors (15350840637214).

21491176892066 is a wasteful number, since it uses less digits than its factorization.

21491176892066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1535084063728.

The product of its (nonzero) digits is 15676416, while the sum is 62.

The spelling of 21491176892066 in words is "twenty-one trillion, four hundred ninety-one billion, one hundred seventy-six million, eight hundred ninety-two thousand, sixty-six".