21130205554 has 8 divisors (see below), whose sum is σ = 32717737728. Its totient is φ = 10224292980.

The previous prime is 21130205491. The next prime is 21130205567. The reversal of 21130205554 is 45550203112.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170404822 + ... + 170404945.

It is an arithmetic number, because the mean of its divisors is an integer number (4089717216).

Almost surely, 2^21130205554 is an apocalyptic number.

21130205554 is a deficient number, since it is larger than the sum of its proper divisors (11587532174).

21130205554 is a wasteful number, since it uses less digits than its factorization.

21130205554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340809800.

The product of its (nonzero) digits is 6000, while the sum is 28.

Adding to 21130205554 its reverse (45550203112), we get a palindrome (66680408666).

The spelling of 21130205554 in words is "twenty-one billion, one hundred thirty million, two hundred five thousand, five hundred fifty-four".