21108315514 has 16 divisors (see below), whose sum is σ = 37197871200. Its totient is φ = 8856635760.

The previous prime is 21108315509. The next prime is 21108315517. The reversal of 21108315514 is 41551380112.

It is not an unprimeable number, because it can be changed into a prime (21108315517) by changing a digit.

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, 36902364 + ... + 36902935.

It is an arithmetic number, because the mean of its divisors is an integer number (2324866950).

Almost surely, 2^21108315514 is an apocalyptic number.

21108315514 is a deficient number, since it is larger than the sum of its proper divisors (16089555686).

21108315514 is a wasteful number, since it uses less digits than its factorization.

21108315514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73805325.

The product of its (nonzero) digits is 4800, while the sum is 31.

Adding to 21108315514 its reverse (41551380112), we get a palindrome (62659695626).

The spelling of 21108315514 in words is "twenty-one billion, one hundred eight million, three hundred fifteen thousand, five hundred fourteen".