21116400163646 has 8 divisors (see below), whose sum is σ = 32193855987384. Its totient is φ = 10385114834520.

The previous prime is 21116400163631. The next prime is 21116400163679. The reversal of 21116400163646 is 64636100461112.

It is a happy number.

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, 86542623500 + ... + 86542623743.

It is an arithmetic number, because the mean of its divisors is an integer number (4024231998423).

Almost surely, 2^{21116400163646} is an apocalyptic number.

21116400163646 is a deficient number, since it is larger than the sum of its proper divisors (11077455823738).

21116400163646 is a wasteful number, since it uses less digits than its factorization.

21116400163646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173085247306.

The product of its (nonzero) digits is 124416, while the sum is 41.

The spelling of 21116400163646 in words is "twenty-one trillion, one hundred sixteen billion, four hundred million, one hundred sixty-three thousand, six hundred forty-six".