891121121198 has 64 divisors (see below), whose sum is σ = 1771592532480. Its totient is φ = 325660176000.

The previous prime is 891121121161. The next prime is 891121121227.

891121121198 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1212161 + ... + 1803212.

It is an arithmetic number, because the mean of its divisors is an integer number (27681133320).

Almost surely, 2^891121121198 is an apocalyptic number.

891121121198 is a deficient number, since it is larger than the sum of its proper divisors (880471411282).

891121121198 is a wasteful number, since it uses less digits than its factorization.

891121121198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3015513.

The product of its digits is 20736, while the sum is 44.

The spelling of 891121121198 in words is "eight hundred ninety-one billion, one hundred twenty-one million, one hundred twenty-one thousand, one hundred ninety-eight".