21103534340554 has 16 divisors (see below), whose sum is σ = 32565703128192. Its totient is φ = 10252165789008.

The previous prime is 21103534340549. The next prime is 21103534340563. The reversal of 21103534340554 is 45504343530112.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 966445134 + ... + 966466969.

It is an arithmetic number, because the mean of its divisors is an integer number (2035356445512).

Almost surely, 2^{21103534340554} is an apocalyptic number.

21103534340554 is a deficient number, since it is larger than the sum of its proper divisors (11462168787638).

21103534340554 is a wasteful number, since it uses less digits than its factorization.

21103534340554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1932912261.

The product of its (nonzero) digits is 432000, while the sum is 40.

Adding to 21103534340554 its reverse (45504343530112), we get a palindrome (66607877870666).

The spelling of 21103534340554 in words is "twenty-one trillion, one hundred three billion, five hundred thirty-four million, three hundred forty thousand, five hundred fifty-four".