21344424243 has 8 divisors (see below), whose sum is σ = 28581375888. Its totient is φ = 14168544384.

The previous prime is 21344424217. The next prime is 21344424259. The reversal of 21344424243 is 34242444312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21344424243 - 2¹⁷ = 21344293171 is a prime.

It is a super-2 number, since 2×21344424243² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21344424263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15267130 + ... + 15268527.

It is an arithmetic number, because the mean of its divisors is an integer number (3572671986).

Almost surely, 2^21344424243 is an apocalyptic number.

21344424243 is a deficient number, since it is larger than the sum of its proper divisors (7236951645).

21344424243 is a wasteful number, since it uses less digits than its factorization.

21344424243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30535893.

The product of its digits is 73728, while the sum is 33.

Adding to 21344424243 its reverse (34242444312), we get a palindrome (55586868555).

The spelling of 21344424243 in words is "twenty-one billion, three hundred forty-four million, four hundred twenty-four thousand, two hundred forty-three".