19221643945 has 8 divisors (see below), whose sum is σ = 26361111744. Its totient is φ = 13180555824.

The previous prime is 19221643907. The next prime is 19221643951. The reversal of 19221643945 is 54934612291.

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 19221643945 - 2³³ = 10631709353 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19221643895 and 19221643904.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 274594879 + ... + 274594948.

It is an arithmetic number, because the mean of its divisors is an integer number (3295138968).

Almost surely, 2^19221643945 is an apocalyptic number.

It is an amenable number.

19221643945 is a deficient number, since it is larger than the sum of its proper divisors (7139467799).

19221643945 is an equidigital number, since it uses as much as digits as its factorization.

19221643945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549189839.

The product of its digits is 466560, while the sum is 46.

The spelling of 19221643945 in words is "nineteen billion, two hundred twenty-one million, six hundred forty-three thousand, nine hundred forty-five".