21434443324331 has 4 divisors (see below), whose sum is σ = 21438954893664. Its totient is φ = 21429931755000.

The previous prime is 21434443324291. The next prime is 21434443324351. The reversal of 21434443324331 is 13342334443412.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21434443324331 is a prime.

It is a super-2 number, since 2×21434443324331² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21434443324351) 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, 2255777540 + ... + 2255787041.

It is an arithmetic number, because the mean of its divisors is an integer number (5359738723416).

Almost surely, 2^{21434443324331} is an apocalyptic number.

21434443324331 is a deficient number, since it is larger than the sum of its proper divisors (4511569333).

21434443324331 is an equidigital number, since it uses as much as digits as its factorization.

21434443324331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4511569332.

The product of its digits is 995328, while the sum is 41.

Adding to 21434443324331 its reverse (13342334443412), we get a palindrome (34776777767743).

The spelling of 21434443324331 in words is "twenty-one trillion, four hundred thirty-four billion, four hundred forty-three million, three hundred twenty-four thousand, three hundred thirty-one".