19121679407 has 4 divisors (see below), whose sum is σ = 20246484096. Its totient is φ = 17996874720.

The previous prime is 19121679391. The next prime is 19121679413. The reversal of 19121679407 is 70497612191.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70497612191 = 7459 ⋅9451349.

It is a cyclic number.

It is not a de Polignac number, because 19121679407 - 2⁴ = 19121679391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19121679457) 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, 562402319 + ... + 562402352.

It is an arithmetic number, because the mean of its divisors is an integer number (5061621024).

Almost surely, 2^19121679407 is an apocalyptic number.

19121679407 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

19121679407 is a deficient number, since it is larger than the sum of its proper divisors (1124804689).

19121679407 is a wasteful number, since it uses less digits than its factorization.

19121679407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1124804688.

The product of its (nonzero) digits is 190512, while the sum is 47.

The spelling of 19121679407 in words is "nineteen billion, one hundred twenty-one million, six hundred seventy-nine thousand, four hundred seven".