8709450021 has 16 divisors (see below), whose sum is σ = 13047868800. Its totient is φ = 5741059104.

The previous prime is 8709450011. The next prime is 8709450041. The reversal of 8709450021 is 1200549078.

It is not a de Polignac number, because 8709450021 - 2⁵ = 8709449989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8709450011) 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, 1809801 + ... + 1814606.

It is an arithmetic number, because the mean of its divisors is an integer number (815491800).

Almost surely, 2^8709450021 is an apocalyptic number.

It is an amenable number.

8709450021 is a deficient number, since it is larger than the sum of its proper divisors (4338418779).

8709450021 is a wasteful number, since it uses less digits than its factorization.

8709450021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3624505 (or 3624499 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 8709450021 is about 93324.4342120540. The cubic root of 8709450021 is about 2057.4545193041.

Adding to 8709450021 its reverse (1200549078), we get a palindrome (9909999099).

The spelling of 8709450021 in words is "eight billion, seven hundred nine million, four hundred fifty thousand, twenty-one".