8542198754221 has 4 divisors (see below), whose sum is σ = 9318762277344. Its totient is φ = 7765635231100.

The previous prime is 8542198754197. The next prime is 8542198754231. The reversal of 8542198754221 is 1224578912458.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8542198754221 - 2⁷ = 8542198754093 is a prime.

It is a super-2 number, since 2×8542198754221² (a number of 27 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 (8542198754231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 388281761545 + ... + 388281761566.

It is an arithmetic number, because the mean of its divisors is an integer number (2329690569336).

Almost surely, 2^{8542198754221} is an apocalyptic number.

It is an amenable number.

8542198754221 is a deficient number, since it is larger than the sum of its proper divisors (776563523123).

8542198754221 is a wasteful number, since it uses less digits than its factorization.

8542198754221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776563523122.

The product of its digits is 12902400, while the sum is 58.

The spelling of 8542198754221 in words is "eight trillion, five hundred forty-two billion, one hundred ninety-eight million, seven hundred fifty-four thousand, two hundred twenty-one".