21364304555 has 8 divisors (see below), whose sum is σ = 27967816944. Its totient is φ = 15537676000.

The previous prime is 21364304531. The next prime is 21364304557. The reversal of 21364304555 is 55540346312.

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

It is not a de Polignac number, because 21364304555 - 2¹⁰ = 21364303531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21364304557) 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, 194220896 + ... + 194221005.

It is an arithmetic number, because the mean of its divisors is an integer number (3495977118).

Almost surely, 2^21364304555 is an apocalyptic number.

21364304555 is a deficient number, since it is larger than the sum of its proper divisors (6603512389).

21364304555 is a wasteful number, since it uses less digits than its factorization.

21364304555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388441917.

The product of its (nonzero) digits is 216000, while the sum is 38.

The spelling of 21364304555 in words is "twenty-one billion, three hundred sixty-four million, three hundred four thousand, five hundred fifty-five".