8211636021 has 8 divisors (see below), whose sum is σ = 11592897984. Its totient is φ = 5152399040.

The previous prime is 8211635981. The next prime is 8211636029. The reversal of 8211636021 is 1206361128.

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 8211636021 - 2⁷ = 8211635893 is a prime.

It is a super-2 number, since 2×8211636021² (a number of 21 digits) contains 22 as substring.

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 8211636021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8211636029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80506185 + ... + 80506286.

It is an arithmetic number, because the mean of its divisors is an integer number (1449112248).

Almost surely, 2^8211636021 is an apocalyptic number.

It is an amenable number.

8211636021 is a deficient number, since it is larger than the sum of its proper divisors (3381261963).

8211636021 is a wasteful number, since it uses less digits than its factorization.

8211636021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161012491.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 8211636021 is about 90618.0777825264. The cubic root of 8211636021 is about 2017.4830610525.

Adding to 8211636021 its reverse (1206361128), we get a palindrome (9417997149).

The spelling of 8211636021 in words is "eight billion, two hundred eleven million, six hundred thirty-six thousand, twenty-one".