8008520921 has 16 divisors (see below), whose sum is σ = 8221836480. Its totient is φ = 7798317120.

The previous prime is 8008520893. The next prime is 8008520951. The reversal of 8008520921 is 1290258008.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8008520921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8008520951) 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, 3949910 + ... + 3951936.

It is an arithmetic number, because the mean of its divisors is an integer number (513864780).

Almost surely, 2^8008520921 is an apocalyptic number.

It is an amenable number.

8008520921 is a deficient number, since it is larger than the sum of its proper divisors (213315559).

8008520921 is a wasteful number, since it uses less digits than its factorization.

8008520921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2744.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 8008520921 is about 89490.3398194464. The cubic root of 8008520921 is about 2000.7098247946.

Adding to 8008520921 its reverse (1290258008), we get a palindrome (9298778929).

The spelling of 8008520921 in words is "eight billion, eight million, five hundred twenty thousand, nine hundred twenty-one".