6553016021 has 4 divisors (see below), whose sum is σ = 6553376844. Its totient is φ = 6552655200.

The previous prime is 6553016009. The next prime is 6553016051. The reversal of 6553016021 is 1206103556.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5592945796 + 960070225 = 74786^2 + 30985^2 .

It is a cyclic number.

It is not a de Polignac number, because 6553016021 - 2¹⁴ = 6552999637 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 (6553016051) 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 3 ways as a sum of consecutive naturals, for example, 151640 + ... + 190001.

It is an arithmetic number, because the mean of its divisors is an integer number (1638344211).

Almost surely, 2^6553016021 is an apocalyptic number.

It is an amenable number.

6553016021 is a deficient number, since it is larger than the sum of its proper divisors (360823).

6553016021 is a wasteful number, since it uses less digits than its factorization.

6553016021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360822.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 6553016021 is about 80950.7011767038. The cubic root of 6553016021 is about 1871.3157660084.

Adding to 6553016021 its reverse (1206103556), we get a palindrome (7759119577).

The spelling of 6553016021 in words is "six billion, five hundred fifty-three million, sixteen thousand, twenty-one".