19621122205 has 4 divisors (see below), whose sum is σ = 23545346652. Its totient is φ = 15696897760.

The previous prime is 19621122197. The next prime is 19621122223. The reversal of 19621122205 is 50222112691.

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 8501208804 + 11119913401 = 92202^2 + 105451^2 .

It is not a de Polignac number, because 19621122205 - 2³ = 19621122197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1962112216 + ... + 1962112225.

It is an arithmetic number, because the mean of its divisors is an integer number (5886336663).

Almost surely, 2^19621122205 is an apocalyptic number.

It is an amenable number.

19621122205 is a deficient number, since it is larger than the sum of its proper divisors (3924224447).

19621122205 is an equidigital number, since it uses as much as digits as its factorization.

19621122205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3924224446.

The product of its (nonzero) digits is 4320, while the sum is 31.

Adding to 19621122205 its reverse (50222112691), we get a palindrome (69843234896).

The spelling of 19621122205 in words is "nineteen billion, six hundred twenty-one million, one hundred twenty-two thousand, two hundred five".