19221628045 has 4 divisors (see below), whose sum is σ = 23065953660. Its totient is φ = 15377302432.

The previous prime is 19221628009. The next prime is 19221628073. The reversal of 19221628045 is 54082612291.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4869108841 + 14352519204 = 69779^2 + 119802^2 .

It is a cyclic number.

It is not a de Polignac number, because 19221628045 - 2²⁵ = 19188073613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19221627989 and 19221628007.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 1922162800 + ... + 1922162809.

It is an arithmetic number, because the mean of its divisors is an integer number (5766488415).

Almost surely, 2^19221628045 is an apocalyptic number.

It is an amenable number.

19221628045 is a deficient number, since it is larger than the sum of its proper divisors (3844325615).

19221628045 is an equidigital number, since it uses as much as digits as its factorization.

19221628045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3844325614.

The product of its (nonzero) digits is 69120, while the sum is 40.

The spelling of 19221628045 in words is "nineteen billion, two hundred twenty-one million, six hundred twenty-eight thousand, forty-five".