194821512105 has 64 divisors (see below), whose sum is σ = 358699622400. Its totient is φ = 89299883520.

The previous prime is 194821512103. The next prime is 194821512203. The reversal of 194821512105 is 501215128491.

194821512105 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 194821512105 - 2¹ = 194821512103 is a prime.

It is not an unprimeable number, because it can be changed into a prime (194821512103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1436797 + ... + 1566533.

It is an arithmetic number, because the mean of its divisors is an integer number (5604681600).

Almost surely, 2^194821512105 is an apocalyptic number.

194821512105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

194821512105 is a deficient number, since it is larger than the sum of its proper divisors (163878110295).

194821512105 is a wasteful number, since it uses less digits than its factorization.

194821512105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130254.

The product of its (nonzero) digits is 28800, while the sum is 39.

The spelling of 194821512105 in words is "one hundred ninety-four billion, eight hundred twenty-one million, five hundred twelve thousand, one hundred five".