21304054511 has 4 divisors (see below), whose sum is σ = 21543426000. Its totient is φ = 21064683024.

The previous prime is 21304054477. The next prime is 21304054517. The reversal of 21304054511 is 11545040312.

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

It is a cyclic number.

It is not a de Polignac number, because 21304054511 - 2³⁴ = 4124185327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21304054517) 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, 119685611 + ... + 119685788.

It is an arithmetic number, because the mean of its divisors is an integer number (5385856500).

Almost surely, 2^21304054511 is an apocalyptic number.

21304054511 is a deficient number, since it is larger than the sum of its proper divisors (239371489).

21304054511 is an equidigital number, since it uses as much as digits as its factorization.

21304054511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239371488.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 21304054511 its reverse (11545040312), we get a palindrome (32849094823).

The spelling of 21304054511 in words is "twenty-one billion, three hundred four million, fifty-four thousand, five hundred eleven".