21116542235 has 8 divisors (see below), whose sum is σ = 25359701616. Its totient is φ = 16879999840.

The previous prime is 21116542217. The next prime is 21116542247. The reversal of 21116542235 is 53224561112.

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

It is a de Polignac number, because none of the positive numbers 2^k-21116542235 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 7 ways as a sum of consecutive naturals, for example, 1647221 + ... + 1659990.

It is an arithmetic number, because the mean of its divisors is an integer number (3169962702).

Almost surely, 2^21116542235 is an apocalyptic number.

21116542235 is a deficient number, since it is larger than the sum of its proper divisors (4243159381).

21116542235 is a wasteful number, since it uses less digits than its factorization.

21116542235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3308493.

The product of its digits is 14400, while the sum is 32.

The spelling of 21116542235 in words is "twenty-one billion, one hundred sixteen million, five hundred forty-two thousand, two hundred thirty-five".