21211111111198 has 32 divisors (see below), whose sum is σ = 33330422661120. Its totient is φ = 10104639452160.

The previous prime is 21211111111187. The next prime is 21211111111199. The reversal of 21211111111198 is 89111111111212.

It is a super-2 number, since 2×21211111111198² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211111111199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19631011 + ... + 20683297.

It is an arithmetic number, because the mean of its divisors is an integer number (1041575708160).

Almost surely, 2^{21211111111198} is an apocalyptic number.

21211111111198 is a deficient number, since it is larger than the sum of its proper divisors (12119311549922).

21211111111198 is a wasteful number, since it uses less digits than its factorization.

21211111111198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1054032.

The product of its digits is 288, while the sum is 31.

The spelling of 21211111111198 in words is "twenty-one trillion, two hundred eleven billion, one hundred eleven million, one hundred eleven thousand, one hundred ninety-eight".