19994048521 has 8 divisors (see below), whose sum is σ = 20687443200. Its totient is φ = 19300916880.

The previous prime is 19994048509. The next prime is 19994048549. The reversal of 19994048521 is 12584049991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19994048521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19994043521) 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, 95650 + ... + 221668.

It is an arithmetic number, because the mean of its divisors is an integer number (2585930400).

Almost surely, 2^19994048521 is an apocalyptic number.

It is an amenable number.

19994048521 is a deficient number, since it is larger than the sum of its proper divisors (693394679).

19994048521 is a wasteful number, since it uses less digits than its factorization.

19994048521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131519.

The product of its (nonzero) digits is 933120, while the sum is 52.

The spelling of 19994048521 in words is "nineteen billion, nine hundred ninety-four million, forty-eight thousand, five hundred twenty-one".