21105481107 has 8 divisors (see below), whose sum is σ = 28164234384. Its totient is φ = 14058524288.

The previous prime is 21105481069. The next prime is 21105481129. The reversal of 21105481107 is 70118450112.

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

It is a cyclic number.

It is not a de Polignac number, because 21105481107 - 2¹⁰ = 21105480083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21105481307) 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, 2944938 + ... + 2952095.

It is an arithmetic number, because the mean of its divisors is an integer number (3520529298).

Almost surely, 2^21105481107 is an apocalyptic number.

21105481107 is a deficient number, since it is larger than the sum of its proper divisors (7058753277).

21105481107 is a wasteful number, since it uses less digits than its factorization.

21105481107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5898229.

The product of its (nonzero) digits is 2240, while the sum is 30.

The spelling of 21105481107 in words is "twenty-one billion, one hundred five million, four hundred eighty-one thousand, one hundred seven".