8621632221 has 16 divisors (see below), whose sum is σ = 11684890560. Its totient is φ = 5653670400.

The previous prime is 8621632207. The next prime is 8621632249. The reversal of 8621632221 is 1222361268.

8621632221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8621632221 - 2¹⁸ = 8621370077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8621632291) 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 15 ways as a sum of consecutive naturals, for example, 18580 + ... + 132621.

It is an arithmetic number, because the mean of its divisors is an integer number (730305660).

Almost surely, 2^8621632221 is an apocalyptic number.

It is an amenable number.

8621632221 is a deficient number, since it is larger than the sum of its proper divisors (3063258339).

8621632221 is a wasteful number, since it uses less digits than its factorization.

8621632221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151516.

The product of its digits is 13824, while the sum is 33.

The square root of 8621632221 is about 92852.7448221107. The cubic root of 8621632221 is about 2050.5160089892.

Adding to 8621632221 its reverse (1222361268), we get a palindrome (9843993489).

The spelling of 8621632221 in words is "eight billion, six hundred twenty-one million, six hundred thirty-two thousand, two hundred twenty-one".