19144067921 has 8 divisors (see below), whose sum is σ = 20932898688. Its totient is φ = 17363314000.

The previous prime is 19144067909. The next prime is 19144067923. The reversal of 19144067921 is 12976044191.

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 19144067921 - 2⁶ = 19144067857 is a prime.

It is a super-2 number, since 2×19144067921² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19144067923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2014250 + ... + 2023731.

It is an arithmetic number, because the mean of its divisors is an integer number (2616612336).

Almost surely, 2^19144067921 is an apocalyptic number.

19144067921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19144067921 is a deficient number, since it is larger than the sum of its proper divisors (1788830767).

19144067921 is a wasteful number, since it uses less digits than its factorization.

19144067921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4038423.

The product of its (nonzero) digits is 108864, while the sum is 44.

The spelling of 19144067921 in words is "nineteen billion, one hundred forty-four million, sixty-seven thousand, nine hundred twenty-one".