8621216087220 has 144 divisors (see below), whose sum is σ = 28872103845312. Its totient is φ = 2064811115520.

The previous prime is 8621216087171. The next prime is 8621216087227. The reversal of 8621216087220 is 227806121268.

8621216087220 is a `hidden beast` number, since 8 + 6 + 2 + 12 + 1 + 608 + 7 + 2 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8621216087227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 26065477 + ... + 26394156.

It is an arithmetic number, because the mean of its divisors is an integer number (200500721148).

Almost surely, 2^{8621216087220} is an apocalyptic number.

It is an amenable number.

8621216087220 is an abundant number, since it is smaller than the sum of its proper divisors (20250887758092).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8621216087220 is a wasteful number, since it uses less digits than its factorization.

8621216087220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52459742 (or 52459737 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The spelling of 8621216087220 in words is "eight trillion, six hundred twenty-one billion, two hundred sixteen million, eighty-seven thousand, two hundred twenty".