19621443339 has 24 divisors (see below), whose sum is σ = 28554686160. Its totient is φ = 12983058432.

The previous prime is 19621443287. The next prime is 19621443353. The reversal of 19621443339 is 93334412691.

It is a happy number.

19621443339 is a `hidden beast` number, since 19 + 621 + 4 + 4 + 3 + 3 + 3 + 9 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-19621443339 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19621443294 and 19621443303.

It is not an unprimeable number, because it can be changed into a prime (19621442339) 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 23 ways as a sum of consecutive naturals, for example, 1119427 + ... + 1136819.

It is an arithmetic number, because the mean of its divisors is an integer number (1189778590).

Almost surely, 2^19621443339 is an apocalyptic number.

19621443339 is a deficient number, since it is larger than the sum of its proper divisors (8933242821).

19621443339 is a wasteful number, since it uses less digits than its factorization.

19621443339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18331 (or 18328 counting only the distinct ones).

The product of its digits is 419904, while the sum is 45.

The spelling of 19621443339 in words is "nineteen billion, six hundred twenty-one million, four hundred forty-three thousand, three hundred thirty-nine".