8218421608715 has 8 divisors (see below), whose sum is σ = 10048183401168. Its totient is φ = 6450685639840.

The previous prime is 8218421608703. The next prime is 8218421608721. The reversal of 8218421608715 is 5178061248128.

It is a happy number.

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

It is not a de Polignac number, because 8218421608715 - 2²⁶ = 8218354499851 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

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, 15506455601 + ... + 15506456130.

It is an arithmetic number, because the mean of its divisors is an integer number (1256022925146).

Almost surely, 2^{8218421608715} is an apocalyptic number.

8218421608715 is a deficient number, since it is larger than the sum of its proper divisors (1829761792453).

8218421608715 is a wasteful number, since it uses less digits than its factorization.

8218421608715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31012911789.

The product of its (nonzero) digits is 1720320, while the sum is 53.

The spelling of 8218421608715 in words is "eight trillion, two hundred eighteen billion, four hundred twenty-one million, six hundred eight thousand, seven hundred fifteen".