8973221164821 has 32 divisors (see below), whose sum is σ = 13520164982400. Its totient is φ = 5880238462080.

The previous prime is 8973221164807. The next prime is 8973221164837. The reversal of 8973221164821 is 1284611223798.

8973221164821 is a `hidden beast` number, since 89 + 7 + 322 + 1 + 164 + 82 + 1 = 666.

8973221164821 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 8973221164821 - 2¹⁸ = 8973220902677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8973221174821) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18327991 + ... + 18811211.

It is an arithmetic number, because the mean of its divisors is an integer number (422505155700).

Almost surely, 2^{8973221164821} is an apocalyptic number.

It is an amenable number.

8973221164821 is a deficient number, since it is larger than the sum of its proper divisors (4546943817579).

8973221164821 is a wasteful number, since it uses less digits than its factorization.

8973221164821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494946 (or 494940 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 54.

The spelling of 8973221164821 in words is "eight trillion, nine hundred seventy-three billion, two hundred twenty-one million, one hundred sixty-four thousand, eight hundred twenty-one".