36000821 has 4 divisors (see below), whose sum is σ = 36150444. Its totient is φ = 35851200.

The previous prime is 36000799. The next prime is 36000823. The reversal of 36000821 is 12800063.

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 31798321 + 4202500 = 5639^2 + 2050^2 .

It is a cyclic number.

It is not a de Polignac number, because 36000821 - 2¹⁰ = 35999797 is a prime.

It is a super-2 number, since 2×36000821² = 2592118225348082, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 36000793 and 36000802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36000823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74450 + ... + 74931.

It is an arithmetic number, because the mean of its divisors is an integer number (9037611).

Almost surely, 2^36000821 is an apocalyptic number.

It is an amenable number.

36000821 is a deficient number, since it is larger than the sum of its proper divisors (149623).

36000821 is a wasteful number, since it uses less digits than its factorization.

36000821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149622.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 36000821 is about 6000.0684162766. The cubic root of 36000821 is about 330.1952349466.

Adding to 36000821 its reverse (12800063), we get a palindrome (48800884).

The spelling of 36000821 in words is "thirty-six million, eight hundred twenty-one", and thus it is an aban number.