19221039393 has 4 divisors (see below), whose sum is σ = 25628052528. Its totient is φ = 12814026260.

The previous prime is 19221039391. The next prime is 19221039419. The reversal of 19221039393 is 39393012291.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19221039393 - 2¹ = 19221039391 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19221039391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3203506563 + ... + 3203506568.

It is an arithmetic number, because the mean of its divisors is an integer number (6407013132).

Almost surely, 2^19221039393 is an apocalyptic number.

It is an amenable number.

19221039393 is a deficient number, since it is larger than the sum of its proper divisors (6407013135).

19221039393 is an equidigital number, since it uses as much as digits as its factorization.

19221039393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6407013134.

The product of its (nonzero) digits is 78732, while the sum is 42.

The spelling of 19221039393 in words is "nineteen billion, two hundred twenty-one million, thirty-nine thousand, three hundred ninety-three".