21110211121018 has 8 divisors (see below), whose sum is σ = 32521136051412. Its totient is φ = 10269832437216.

The previous prime is 21110211120991. The next prime is 21110211121019. The reversal of 21110211121018 is 81012111201112.

It can be written as a sum of positive squares in 2 ways, for example, as 19022830541289 + 2087380579729 = 4361517^2 + 1444777^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 21110211121018.

It is not an unprimeable number, because it can be changed into a prime (21110211121019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142636561555 + ... + 142636561702.

Almost surely, 2^{21110211121018} is an apocalyptic number.

21110211121018 is a deficient number, since it is larger than the sum of its proper divisors (11410924930394).

21110211121018 is a wasteful number, since it uses less digits than its factorization.

21110211121018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285273123296.

The product of its (nonzero) digits is 64, while the sum is 22.

The spelling of 21110211121018 in words is "twenty-one trillion, one hundred ten billion, two hundred eleven million, one hundred twenty-one thousand, eighteen".