21044042107 has 8 divisors (see below), whose sum is σ = 22958703360. Its totient is φ = 19129641960.

The previous prime is 21044042069. The next prime is 21044042141. The reversal of 21044042107 is 70124044012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21044042107 - 2⁷ = 21044041979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21044042207) 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, 128194 + ... + 241912.

It is an arithmetic number, because the mean of its divisors is an integer number (2869837920).

Almost surely, 2^21044042107 is an apocalyptic number.

21044042107 is a deficient number, since it is larger than the sum of its proper divisors (1914661253).

21044042107 is a wasteful number, since it uses less digits than its factorization.

21044042107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130553.

The product of its (nonzero) digits is 1792, while the sum is 25.

Adding to 21044042107 its reverse (70124044012), we get a palindrome (91168086119).

The spelling of 21044042107 in words is "twenty-one billion, forty-four million, forty-two thousand, one hundred seven".