21344345455 has 8 divisors (see below), whose sum is σ = 25636569552. Its totient is φ = 17059906368.

The previous prime is 21344345443. The next prime is 21344345471. The reversal of 21344345455 is 55454344312.

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

It is a cyclic number.

It is not a de Polignac number, because 21344345455 - 2¹¹ = 21344343407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1940217 + ... + 1951186.

It is an arithmetic number, because the mean of its divisors is an integer number (3204571194).

Almost surely, 2^21344345455 is an apocalyptic number.

21344345455 is a deficient number, since it is larger than the sum of its proper divisors (4292224097).

21344345455 is a wasteful number, since it uses less digits than its factorization.

21344345455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3892505.

The product of its digits is 576000, while the sum is 40.

Adding to 21344345455 its reverse (55454344312), we get a palindrome (76798689767).

The spelling of 21344345455 in words is "twenty-one billion, three hundred forty-four million, three hundred forty-five thousand, four hundred fifty-five".