21417073105 has 4 divisors (see below), whose sum is σ = 25700487732. Its totient is φ = 17133658480.

The previous prime is 21417073091. The next prime is 21417073109. The reversal of 21417073105 is 50137071412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5371277521 + 16045795584 = 73289^2 + 126672^2 .

It is not a de Polignac number, because 21417073105 - 2¹¹ = 21417071057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21417073109) 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 3 ways as a sum of consecutive naturals, for example, 2141707306 + ... + 2141707315.

It is an arithmetic number, because the mean of its divisors is an integer number (6425121933).

Almost surely, 2^21417073105 is an apocalyptic number.

It is an amenable number.

21417073105 is a deficient number, since it is larger than the sum of its proper divisors (4283414627).

21417073105 is an equidigital number, since it uses as much as digits as its factorization.

21417073105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4283414626.

The product of its (nonzero) digits is 5880, while the sum is 31.

The spelling of 21417073105 in words is "twenty-one billion, four hundred seventeen million, seventy-three thousand, one hundred five".