8221616381 has 8 divisors (see below), whose sum is σ = 9496626624. Its totient is φ = 7034537920.

The previous prime is 8221616353. The next prime is 8221616387. The reversal of 8221616381 is 1836161228.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8221616381 is a prime.

It is a super-2 number, since 2×8221616381² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8221616387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21982745 + ... + 21983118.

It is an arithmetic number, because the mean of its divisors is an integer number (1187078328).

Almost surely, 2^8221616381 is an apocalyptic number.

It is an amenable number.

8221616381 is a deficient number, since it is larger than the sum of its proper divisors (1275010243).

8221616381 is a wasteful number, since it uses less digits than its factorization.

8221616381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43965891.

The product of its digits is 27648, while the sum is 38.

The square root of 8221616381 is about 90673.1293217566. The cubic root of 8221616381 is about 2018.3000746700.

The spelling of 8221616381 in words is "eight billion, two hundred twenty-one million, six hundred sixteen thousand, three hundred eighty-one".