21060009105 has 32 divisors (see below), whose sum is σ = 36011620224. Its totient is φ = 10472487936.

The previous prime is 21060009101. The next prime is 21060009121. The reversal of 21060009105 is 50190006012.

It is not a de Polignac number, because 21060009105 - 2² = 21060009101 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21060009101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 358642 + ... + 413211.

It is an arithmetic number, because the mean of its divisors is an integer number (1125363132).

Almost surely, 2^21060009105 is an apocalyptic number.

It is an amenable number.

21060009105 is a deficient number, since it is larger than the sum of its proper divisors (14951611119).

21060009105 is a wasteful number, since it uses less digits than its factorization.

21060009105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771985.

The product of its (nonzero) digits is 540, while the sum is 24.

The spelling of 21060009105 in words is "twenty-one billion, sixty million, nine thousand, one hundred five".