536220821 has 4 divisors (see below), whose sum is σ = 540966252. Its totient is φ = 531475392.

The previous prime is 536220743. The next prime is 536220829. The reversal of 536220821 is 128022635.

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 20295025 + 515925796 = 4505^2 + 22714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-536220821 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 (536220829) 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, 2372546 + ... + 2372771.

It is an arithmetic number, because the mean of its divisors is an integer number (135241563).

Almost surely, 2^536220821 is an apocalyptic number.

It is an amenable number.

536220821 is a deficient number, since it is larger than the sum of its proper divisors (4745431).

536220821 is a wasteful number, since it uses less digits than its factorization.

536220821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4745430.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 536220821 is about 23156.4423217385. The cubic root of 536220821 is about 812.4211564046.

The spelling of 536220821 in words is "five hundred thirty-six million, two hundred twenty thousand, eight hundred twenty-one".