21230312105 has 8 divisors (see below), whose sum is σ = 25723718592. Its totient is φ = 16819353648.

The previous prime is 21230312101. The next prime is 21230312107. The reversal of 21230312105 is 50121303212.

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 21230312105 - 2² = 21230312101 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21230312101) 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, 20611439 + ... + 20612468.

It is an arithmetic number, because the mean of its divisors is an integer number (3215464824).

Almost surely, 2^21230312105 is an apocalyptic number.

It is an amenable number.

21230312105 is a deficient number, since it is larger than the sum of its proper divisors (4493406487).

21230312105 is a wasteful number, since it uses less digits than its factorization.

21230312105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41224015.

The product of its (nonzero) digits is 360, while the sum is 20.

Adding to 21230312105 its reverse (50121303212), we get a palindrome (71351615317).

The spelling of 21230312105 in words is "twenty-one billion, two hundred thirty million, three hundred twelve thousand, one hundred five".