21301030105 has 4 divisors (see below), whose sum is σ = 25561236132. Its totient is φ = 17040824080.

The previous prime is 21301030087. The next prime is 21301030133. The reversal of 21301030105 is 50103010312.

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 11757498624 + 9543531481 = 108432^2 + 97691^2 .

It is not a de Polignac number, because 21301030105 - 2⁷ = 21301029977 is a prime.

It is a super-2 number, since 2×21301030105² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2130103006 + ... + 2130103015.

It is an arithmetic number, because the mean of its divisors is an integer number (6390309033).

Almost surely, 2^21301030105 is an apocalyptic number.

It is an amenable number.

21301030105 is a deficient number, since it is larger than the sum of its proper divisors (4260206027).

21301030105 is an equidigital number, since it uses as much as digits as its factorization.

21301030105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4260206026.

The product of its (nonzero) digits is 90, while the sum is 16.

Adding to 21301030105 its reverse (50103010312), we get a palindrome (71404040417).

The spelling of 21301030105 in words is "twenty-one billion, three hundred one million, thirty thousand, one hundred five".