21155015116042 has 16 divisors (see below), whose sum is σ = 32270514929280. Its totient is φ = 10398178505152.

The previous prime is 21155015116007. The next prime is 21155015116069. The reversal of 21155015116042 is 24061151055112.

It is a junction number, because it is equal to n+sod(n) for n = 21155015115989 and 21155015116007.

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, 46006338 + ... + 46463890.

It is an arithmetic number, because the mean of its divisors is an integer number (2016907183080).

Almost surely, 2^{21155015116042} is an apocalyptic number.

21155015116042 is a deficient number, since it is larger than the sum of its proper divisors (11115499813238).

21155015116042 is a wasteful number, since it uses less digits than its factorization.

21155015116042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849437.

The product of its (nonzero) digits is 12000, while the sum is 34.

The spelling of 21155015116042 in words is "twenty-one trillion, one hundred fifty-five billion, fifteen million, one hundred sixteen thousand, forty-two".