8421198129 has 10 divisors (see below), whose sum is σ = 12579814610. Its totient is φ = 5614132032.

The previous prime is 8421198119. The next prime is 8421198161. The reversal of 8421198129 is 9218911248.

It can be written as a sum of positive squares in only one way, i.e., 4469189904 + 3952008225 = 66852^2 + 62865^2 .

It is not a de Polignac number, because 8421198129 - 2¹⁶ = 8421132593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8421198119) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 51982624 + ... + 51982785.

It is an arithmetic number, because the mean of its divisors is an integer number (1257981461).

Almost surely, 2^8421198129 is an apocalyptic number.

It is an amenable number.

8421198129 is a deficient number, since it is larger than the sum of its proper divisors (4158616481).

8421198129 is a wasteful number, since it uses less digits than its factorization.

8421198129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103965421 (or 103965412 counting only the distinct ones).

The product of its digits is 82944, while the sum is 45.

The square root of 8421198129 is about 91767.0863054941. The cubic root of 8421198129 is about 2034.5012534952.

The spelling of 8421198129 in words is "eight billion, four hundred twenty-one million, one hundred ninety-eight thousand, one hundred twenty-nine".