21043354315 has 8 divisors (see below), whose sum is σ = 25352632368. Its totient is φ = 16767612000.

The previous prime is 21043354289. The next prime is 21043354331. The reversal of 21043354315 is 51345334012.

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

It is not a de Polignac number, because 21043354315 - 2³³ = 12453419723 is a prime.

It is a Duffinian 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, 8382552 + ... + 8385061.

It is an arithmetic number, because the mean of its divisors is an integer number (3169079046).

Almost surely, 2^21043354315 is an apocalyptic number.

21043354315 is a deficient number, since it is larger than the sum of its proper divisors (4309278053).

21043354315 is a wasteful number, since it uses less digits than its factorization.

21043354315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16767869.

The product of its (nonzero) digits is 21600, while the sum is 31.

Adding to 21043354315 its reverse (51345334012), we get a palindrome (72388688327).

The spelling of 21043354315 in words is "twenty-one billion, forty-three million, three hundred fifty-four thousand, three hundred fifteen".