19122204821 has 4 divisors (see below), whose sum is σ = 19133317644. Its totient is φ = 19111092000.

The previous prime is 19122204797. The next prime is 19122204823. The reversal of 19122204821 is 12840222191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12840222191 = 41 ⋅313176151.

It can be written as a sum of positive squares in 2 ways, for example, as 17308296721 + 1813908100 = 131561^2 + 42590^2 .

It is a cyclic number.

It is not a de Polignac number, because 19122204821 - 2⁶ = 19122204757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19122204823) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5553830 + ... + 5557271.

It is an arithmetic number, because the mean of its divisors is an integer number (4783329411).

Almost surely, 2^19122204821 is an apocalyptic number.

It is an amenable number.

19122204821 is a deficient number, since it is larger than the sum of its proper divisors (11112823).

19122204821 is a wasteful number, since it uses less digits than its factorization.

19122204821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11112822.

The product of its (nonzero) digits is 4608, while the sum is 32.

The spelling of 19122204821 in words is "nineteen billion, one hundred twenty-two million, two hundred four thousand, eight hundred twenty-one".