21230412043 has 4 divisors (see below), whose sum is σ = 21245876208. Its totient is φ = 21214947880.

The previous prime is 21230412041. The next prime is 21230412053. The reversal of 21230412043 is 34021403212.

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

It is a cyclic number.

It is not a de Polignac number, because 21230412043 - 2¹ = 21230412041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21230412041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7730023 + ... + 7732768.

It is an arithmetic number, because the mean of its divisors is an integer number (5311469052).

Almost surely, 2^21230412043 is an apocalyptic number.

21230412043 is a deficient number, since it is larger than the sum of its proper divisors (15464165).

21230412043 is a wasteful number, since it uses less digits than its factorization.

21230412043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15464164.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21230412043 its reverse (34021403212), we get a palindrome (55251815255).

The spelling of 21230412043 in words is "twenty-one billion, two hundred thirty million, four hundred twelve thousand, forty-three".