8821457201720 has 64 divisors (see below), whose sum is σ = 21462969790080. Its totient is φ = 3250359187456.

The previous prime is 8821457201677. The next prime is 8821457201723. The reversal of 8821457201720 is 271027541288.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8821457201723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137975819 + ... + 138039738.

It is an arithmetic number, because the mean of its divisors is an integer number (335358902970).

Almost surely, 2^{8821457201720} is an apocalyptic number.

It is an amenable number.

8821457201720 is an abundant number, since it is smaller than the sum of its proper divisors (12641512588360).

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

8821457201720 is a wasteful number, since it uses less digits than its factorization.

8821457201720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276015632 (or 276015628 counting only the distinct ones).

The product of its (nonzero) digits is 501760, while the sum is 47.

The spelling of 8821457201720 in words is "eight trillion, eight hundred twenty-one billion, four hundred fifty-seven million, two hundred one thousand, seven hundred twenty".