8631198642221 has 8 divisors (see below), whose sum is σ = 8735399127840. Its totient is φ = 8527003160112.

The previous prime is 8631198642161. The next prime is 8631198642239. The reversal of 8631198642221 is 1222468911368.

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-8631198642221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8631198642271) 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, 2279795 + ... + 4739183.

It is an arithmetic number, because the mean of its divisors is an integer number (1091924890980).

Almost surely, 2^{8631198642221} is an apocalyptic number.

It is an amenable number.

8631198642221 is a deficient number, since it is larger than the sum of its proper divisors (104200485619).

8631198642221 is a wasteful number, since it uses less digits than its factorization.

8631198642221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2501755.

The product of its digits is 1990656, while the sum is 53.

The spelling of 8631198642221 in words is "eight trillion, six hundred thirty-one billion, one hundred ninety-eight million, six hundred forty-two thousand, two hundred twenty-one".