19436798221 has 8 divisors (see below), whose sum is σ = 20068160000. Its totient is φ = 18805709520.

The previous prime is 19436798203. The next prime is 19436798263. The reversal of 19436798221 is 12289763491.

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

It is a cyclic number.

It is not a de Polignac number, because 19436798221 - 2⁵ = 19436798189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19436798321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81655 + ... + 213403.

It is an arithmetic number, because the mean of its divisors is an integer number (2508520000).

Almost surely, 2^19436798221 is an apocalyptic number.

It is an amenable number.

19436798221 is a deficient number, since it is larger than the sum of its proper divisors (631361779).

19436798221 is a wasteful number, since it uses less digits than its factorization.

19436798221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136539.

The product of its digits is 1306368, while the sum is 52.

The spelling of 19436798221 in words is "nineteen billion, four hundred thirty-six million, seven hundred ninety-eight thousand, two hundred twenty-one".