19319614921 has 4 divisors (see below), whose sum is σ = 19332643792. Its totient is φ = 19306586052.

The previous prime is 19319614883. The next prime is 19319614973. The reversal of 19319614921 is 12941691391.

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 19319614921 - 2¹³ = 19319606729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19319614021) 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, 6512211 + ... + 6515176.

It is an arithmetic number, because the mean of its divisors is an integer number (4833160948).

Almost surely, 2^19319614921 is an apocalyptic number.

It is an amenable number.

19319614921 is a deficient number, since it is larger than the sum of its proper divisors (13028871).

19319614921 is a wasteful number, since it uses less digits than its factorization.

19319614921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13028870.

The product of its digits is 104976, while the sum is 46.

The spelling of 19319614921 in words is "nineteen billion, three hundred nineteen million, six hundred fourteen thousand, nine hundred twenty-one".