19999899241 has 27 divisors (see below), whose sum is σ = 23633643639. Its totient is φ = 16875485088.

The previous prime is 19999899239. The next prime is 19999899277. The reversal of 19999899241 is 14299899991.

The square root of 19999899241 is 141421.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 3840404841 + 16159494400 = 61971^2 + 127120^2 .

It is not a de Polignac number, because 19999899241 - 2¹ = 19999899239 is a prime.

It is a Smith number, since the sum of its digits (70) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19999899211) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 88105170 + ... + 88105396.

Almost surely, 2^19999899241 is an apocalyptic number.

19999899241 is the 141421-st square number.

19999899241 is the 70711-st centered octagonal number.

It is an amenable number.

19999899241 is a deficient number, since it is larger than the sum of its proper divisors (3633744398).

19999899241 is an frugal number, since it uses more digits than its factorization.

19999899241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646 (or 323 counting only the distinct ones).

The product of its digits is 34012224, while the sum is 70.

The spelling of 19999899241 in words is "nineteen billion, nine hundred ninety-nine million, eight hundred ninety-nine thousand, two hundred forty-one".