19221045668 has 24 divisors (see below), whose sum is σ = 36721070400. Its totient is φ = 8730565920.

The previous prime is 19221045659. The next prime is 19221045671. The reversal of 19221045668 is 86654012291.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 94571 + ... + 217682.

It is an arithmetic number, because the mean of its divisors is an integer number (1530044600).

Almost surely, 2^19221045668 is an apocalyptic number.

It is an amenable number.

19221045668 is a deficient number, since it is larger than the sum of its proper divisors (17500024732).

19221045668 is a wasteful number, since it uses less digits than its factorization.

19221045668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313667 (or 313665 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 44.

The spelling of 19221045668 in words is "nineteen billion, two hundred twenty-one million, forty-five thousand, six hundred sixty-eight".