21384938106 has 48 divisors (see below), whose sum is σ = 54184663104. Its totient is φ = 5967888192.

The previous prime is 21384938093. The next prime is 21384938123. The reversal of 21384938106 is 60183948312.

21384938106 is a `hidden beast` number, since 21 + 38 + 493 + 8 + 106 = 666.

It is a Curzon number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1968091 + ... + 1978926.

It is an arithmetic number, because the mean of its divisors is an integer number (1128847148).

Almost surely, 2^21384938106 is an apocalyptic number.

21384938106 is an abundant number, since it is smaller than the sum of its proper divisors (32799724998).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21384938106 is a wasteful number, since it uses less digits than its factorization.

21384938106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3947075 (or 3947072 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The spelling of 21384938106 in words is "twenty-one billion, three hundred eighty-four million, nine hundred thirty-eight thousand, one hundred six".