21300120553 has 8 divisors (see below), whose sum is σ = 22002982400. Its totient is φ = 20598243840.

The previous prime is 21300120547. The next prime is 21300120557. The reversal of 21300120553 is 35502100312.

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

It is a cyclic number.

It is not a de Polignac number, because 21300120553 - 2¹⁷ = 21299989481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21300120557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202200 + ... + 288937.

It is an arithmetic number, because the mean of its divisors is an integer number (2750372800).

Almost surely, 2^21300120553 is an apocalyptic number.

It is an amenable number.

21300120553 is a deficient number, since it is larger than the sum of its proper divisors (702861847).

21300120553 is a wasteful number, since it uses less digits than its factorization.

21300120553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492567.

The product of its (nonzero) digits is 900, while the sum is 22.

Adding to 21300120553 its reverse (35502100312), we get a palindrome (56802220865).

The spelling of 21300120553 in words is "twenty-one billion, three hundred million, one hundred twenty thousand, five hundred fifty-three".