21230312106 has 8 divisors (see below), whose sum is σ = 42460624224. Its totient is φ = 7076770700.

The previous prime is 21230312101. The next prime is 21230312107. The reversal of 21230312106 is 60121303212.

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

21230312106 is an admirable 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 3 ways as a sum of consecutive naturals, for example, 1769192670 + ... + 1769192681.

It is an arithmetic number, because the mean of its divisors is an integer number (5307578028).

Almost surely, 2^21230312106 is an apocalyptic number.

21230312106 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21230312106 is a wasteful number, since it uses less digits than its factorization.

21230312106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3538385356.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21230312106 its reverse (60121303212), we get a palindrome (81351615318).

It can be divided in two parts, 21230 and 312106, that added together give a triangular number (333336 = T₈₁₆).

The spelling of 21230312106 in words is "twenty-one billion, two hundred thirty million, three hundred twelve thousand, one hundred six".