19621036194 has 8 divisors (see below), whose sum is σ = 39242072400. Its totient is φ = 6540345396.

The previous prime is 19621036189. The next prime is 19621036247. The reversal of 19621036194 is 49163012691.

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

19621036194 is an admirable number.

It is a super-2 number, since 2×19621036194² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1635086344 + ... + 1635086355.

It is an arithmetic number, because the mean of its divisors is an integer number (4905259050).

Almost surely, 2^19621036194 is an apocalyptic number.

19621036194 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19621036194 is a wasteful number, since it uses less digits than its factorization.

19621036194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3270172704.

The product of its (nonzero) digits is 69984, while the sum is 42.

The spelling of 19621036194 in words is "nineteen billion, six hundred twenty-one million, thirty-six thousand, one hundred ninety-four".