21230412334 has 4 divisors (see below), whose sum is σ = 31845618504. Its totient is φ = 10615206166.

The previous prime is 21230412331. The next prime is 21230412377. The reversal of 21230412334 is 43321403212.

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

It is a junction number, because it is equal to n+sod(n) for n = 21230412299 and 21230412308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230412331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5307603082 + ... + 5307603085.

It is an arithmetic number, because the mean of its divisors is an integer number (7961404626).

Almost surely, 2^21230412334 is an apocalyptic number.

21230412334 is a deficient number, since it is larger than the sum of its proper divisors (10615206170).

21230412334 is a wasteful number, since it uses less digits than its factorization.

21230412334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10615206169.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21230412334 its reverse (43321403212), we get a palindrome (64551815546).

The spelling of 21230412334 in words is "twenty-one billion, two hundred thirty million, four hundred twelve thousand, three hundred thirty-four".