21116400163645 has 16 divisors (see below), whose sum is σ = 25347614374080. Its totient is φ = 16887831264000.

The previous prime is 21116400163631. The next prime is 21116400163679. The reversal of 21116400163645 is 54636100461112.

It is not a de Polignac number, because 21116400163645 - 2⁵ = 21116400163613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21116400163598 and 21116400163607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 451480821 + ... + 451527589.

It is an arithmetic number, because the mean of its divisors is an integer number (1584225898380).

Almost surely, 2^{21116400163645} is an apocalyptic number.

It is an amenable number.

21116400163645 is a deficient number, since it is larger than the sum of its proper divisors (4231214210435).

21116400163645 is a wasteful number, since it uses less digits than its factorization.

21116400163645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73116.

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 21116400163645 in words is "twenty-one trillion, one hundred sixteen billion, four hundred million, one hundred sixty-three thousand, six hundred forty-five".