8820721242 has 24 divisors (see below), whose sum is σ = 19113546816. Its totient is φ = 2939935176.

The previous prime is 8820721241. The next prime is 8820721249. The reversal of 8820721242 is 2421270288.

It is a junction number, because it is equal to n+sod(n) for n = 8820721197 and 8820721206.

It is not an unprimeable number, because it can be changed into a prime (8820721241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 213343 + ... + 251309.

It is an arithmetic number, because the mean of its divisors is an integer number (796397784).

Almost surely, 2^8820721242 is an apocalyptic number.

8820721242 is an abundant number, since it is smaller than the sum of its proper divisors (10292825574).

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

8820721242 is a wasteful number, since it uses less digits than its factorization.

8820721242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50882 (or 50879 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 36.

The square root of 8820721242 is about 93918.6948482569. The cubic root of 8820721242 is about 2066.1794247762.

The spelling of 8820721242 in words is "eight billion, eight hundred twenty million, seven hundred twenty-one thousand, two hundred forty-two".