194191021401 has 16 divisors (see below), whose sum is σ = 290961799296. Its totient is φ = 114306420096.

The previous prime is 194191021361. The next prime is 194191021411. The reversal of 194191021401 is 104120191491.

It is a happy number.

It is not a de Polignac number, because 194191021401 - 2⁹ = 194191020889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (194191021411) 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, 108243820 + ... + 108245613.

It is an arithmetic number, because the mean of its divisors is an integer number (18185112456).

Almost surely, 2^194191021401 is an apocalyptic number.

It is an amenable number.

194191021401 is a deficient number, since it is larger than the sum of its proper divisors (96770777895).

194191021401 is a wasteful number, since it uses less digits than its factorization.

194191021401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216489472.

The product of its (nonzero) digits is 2592, while the sum is 33.

The spelling of 194191021401 in words is "one hundred ninety-four billion, one hundred ninety-one million, twenty-one thousand, four hundred one".