21230312134 has 16 divisors (see below), whose sum is σ = 32085407376. Its totient is φ = 10535212800.

The previous prime is 21230312107. The next prime is 21230312209. The reversal of 21230312134 is 43121303212.

It is a congruent number.

It is an unprimeable number.

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, 1901749 + ... + 1912879.

It is an arithmetic number, because the mean of its divisors is an integer number (2005337961).

Almost surely, 2^21230312134 is an apocalyptic number.

21230312134 is a deficient number, since it is larger than the sum of its proper divisors (10855095242).

21230312134 is a wasteful number, since it uses less digits than its factorization.

21230312134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18231.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21230312134 its reverse (43121303212), we get a palindrome (64351615346).

The spelling of 21230312134 in words is "twenty-one billion, two hundred thirty million, three hundred twelve thousand, one hundred thirty-four".