21106517103 has 18 divisors (see below), whose sum is σ = 35464692744. Its totient is φ = 12060866664.

The previous prime is 21106517101. The next prime is 21106517129. The reversal of 21106517103 is 30171560112.

21106517103 is a `hidden beast` number, since 2 + 1 + 1 + 0 + 651 + 7 + 1 + 0 + 3 = 666.

It is not a de Polignac number, because 21106517103 - 2¹ = 21106517101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21106517101) 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 17 ways as a sum of consecutive naturals, for example, 23929851 + ... + 23930732.

It is an arithmetic number, because the mean of its divisors is an integer number (1970260708).

Almost surely, 2^21106517103 is an apocalyptic number.

21106517103 is a deficient number, since it is larger than the sum of its proper divisors (14358175641).

21106517103 is a wasteful number, since it uses less digits than its factorization.

21106517103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47860603 (or 47860593 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The spelling of 21106517103 in words is "twenty-one billion, one hundred six million, five hundred seventeen thousand, one hundred three".