8521621715 has 8 divisors (see below), whose sum is σ = 10226964048. Its totient is φ = 6816618720.

The previous prime is 8521621697. The next prime is 8521621729. The reversal of 8521621715 is 5171261258.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8521621715 - 2¹² = 8521617619 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25856 + ... + 133085.

It is an arithmetic number, because the mean of its divisors is an integer number (1278370506).

Almost surely, 2^8521621715 is an apocalyptic number.

8521621715 is a deficient number, since it is larger than the sum of its proper divisors (1705342333).

8521621715 is a wasteful number, since it uses less digits than its factorization.

8521621715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169669.

The product of its digits is 33600, while the sum is 38.

The square root of 8521621715 is about 92312.6303113501. The cubic root of 8521621715 is about 2042.5565246606.

The spelling of 8521621715 in words is "eight billion, five hundred twenty-one million, six hundred twenty-one thousand, seven hundred fifteen".