21553130284 has 24 divisors (see below), whose sum is σ = 44108734208. Its totient is φ = 9022240080.

The previous prime is 21553130279. The next prime is 21553130311. The reversal of 21553130284 is 48203135512.

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, 8949432 + ... + 8951839.

Almost surely, 2^21553130284 is an apocalyptic number.

It is an amenable number.

21553130284 is an abundant number, since it is smaller than the sum of its proper divisors (22555603924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21553130284 is a wasteful number, since it uses less digits than its factorization.

21553130284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17901325 (or 17901323 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

Adding to 21553130284 its reverse (48203135512), we get a palindrome (69756265796).

The spelling of 21553130284 in words is "twenty-one billion, five hundred fifty-three million, one hundred thirty thousand, two hundred eighty-four".