29998394216891 has 8 divisors (see below), whose sum is σ = 31778911038240. Its totient is φ = 28219644661888.

The previous prime is 29998394216863. The next prime is 29998394216897. The reversal of 29998394216891 is 19861249389992.

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-29998394216891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (29998394216897) 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, 441781631 + ... + 441849528.

It is an arithmetic number, because the mean of its divisors is an integer number (3972363879780).

Almost surely, 2^{29998394216891} is an apocalyptic number.

29998394216891 is a deficient number, since it is larger than the sum of its proper divisors (1780516821349).

29998394216891 is a wasteful number, since it uses less digits than its factorization.

29998394216891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883633173.

The product of its digits is 1088391168, while the sum is 80.

The spelling of 29998394216891 in words is "twenty-nine trillion, nine hundred ninety-eight billion, three hundred ninety-four million, two hundred sixteen thousand, eight hundred ninety-one".