19628927421 has 8 divisors (see below), whose sum is σ = 27309812160. Its totient is φ = 12516997152.

The previous prime is 19628927399. The next prime is 19628927429. The reversal of 19628927421 is 12472982691.

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

It is not a de Polignac number, because 19628927421 - 2⁹ = 19628926909 is a prime.

It is a super-2 number, since 2×19628927421² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19628927429) 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, 142238536 + ... + 142238673.

It is an arithmetic number, because the mean of its divisors is an integer number (3413726520).

Almost surely, 2^19628927421 is an apocalyptic number.

It is an amenable number.

19628927421 is a deficient number, since it is larger than the sum of its proper divisors (7680884739).

19628927421 is a wasteful number, since it uses less digits than its factorization.

19628927421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284477235.

The product of its digits is 870912, while the sum is 51.

The spelling of 19628927421 in words is "nineteen billion, six hundred twenty-eight million, nine hundred twenty-seven thousand, four hundred twenty-one".