21014450553 has 8 divisors (see below), whose sum is σ = 28110536608. Its totient is φ = 13963999104.

The previous prime is 21014450539. The next prime is 21014450563. The reversal of 21014450553 is 35505441012.

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

It is not a de Polignac number, because 21014450553 - 2⁶ = 21014450489 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21014450553.

It is not an unprimeable number, because it can be changed into a prime (21014450563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11407576 + ... + 11409417.

It is an arithmetic number, because the mean of its divisors is an integer number (3513817076).

Almost surely, 2^21014450553 is an apocalyptic number.

It is an amenable number.

21014450553 is a deficient number, since it is larger than the sum of its proper divisors (7096086055).

21014450553 is a wasteful number, since it uses less digits than its factorization.

21014450553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22817303.

The product of its (nonzero) digits is 12000, while the sum is 30.

Adding to 21014450553 its reverse (35505441012), we get a palindrome (56519891565).

The spelling of 21014450553 in words is "twenty-one billion, fourteen million, four hundred fifty thousand, five hundred fifty-three".