21111033194 has 8 divisors (see below), whose sum is σ = 33529288068. Its totient is φ = 9934603840.

The previous prime is 21111033191. The next prime is 21111033233. The reversal of 21111033194 is 49133011112.

It can be written as a sum of positive squares in 2 ways, for example, as 20639057569 + 471975625 = 143663^2 + 21725^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21111033191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310456337 + ... + 310456404.

Almost surely, 2^21111033194 is an apocalyptic number.

21111033194 is a deficient number, since it is larger than the sum of its proper divisors (12418254874).

21111033194 is a wasteful number, since it uses less digits than its factorization.

21111033194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620912760.

The product of its (nonzero) digits is 648, while the sum is 26.

The spelling of 21111033194 in words is "twenty-one billion, one hundred eleven million, thirty-three thousand, one hundred ninety-four".