21116546155 has 4 divisors (see below), whose sum is σ = 25339855392. Its totient is φ = 16893236920.

The previous prime is 21116546119. The next prime is 21116546183. The reversal of 21116546155 is 55164561112.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21116546155 - 2⁷ = 21116546027 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2111654611 + ... + 2111654620.

It is an arithmetic number, because the mean of its divisors is an integer number (6334963848).

Almost surely, 2^21116546155 is an apocalyptic number.

21116546155 is a deficient number, since it is larger than the sum of its proper divisors (4223309237).

21116546155 is an equidigital number, since it uses as much as digits as its factorization.

21116546155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4223309236.

The product of its digits is 36000, while the sum is 37.

The spelling of 21116546155 in words is "twenty-one billion, one hundred sixteen million, five hundred forty-six thousand, one hundred fifty-five".