21434443413 has 4 divisors (see below), whose sum is σ = 28579257888. Its totient is φ = 14289628940.

The previous prime is 21434443391. The next prime is 21434443463. The reversal of 21434443413 is 31434443412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21434443413 - 2³⁰ = 20360701589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21434443463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3572407233 + ... + 3572407238.

It is an arithmetic number, because the mean of its divisors is an integer number (7144814472).

Almost surely, 2^21434443413 is an apocalyptic number.

It is an amenable number.

21434443413 is a deficient number, since it is larger than the sum of its proper divisors (7144814475).

21434443413 is an equidigital number, since it uses as much as digits as its factorization.

21434443413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7144814474.

The product of its digits is 55296, while the sum is 33.

Adding to 21434443413 its reverse (31434443412), we get a palindrome (52868886825).

Subtracting 21434443413 from its reverse (31434443412), we obtain a palindrome (9999999999).

The spelling of 21434443413 in words is "twenty-one billion, four hundred thirty-four million, four hundred forty-three thousand, four hundred thirteen".