19886041021 has 16 divisors (see below), whose sum is σ = 24819424128. Its totient is φ = 15479092800.

The previous prime is 19886041009. The next prime is 19886041027. The reversal of 19886041021 is 12014068891.

It is a cyclic number.

It is not a de Polignac number, because 19886041021 - 2¹⁹ = 19885516733 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 (19886041027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64770 + ... + 209683.

It is an arithmetic number, because the mean of its divisors is an integer number (1551214008).

Almost surely, 2^19886041021 is an apocalyptic number.

19886041021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19886041021 is a deficient number, since it is larger than the sum of its proper divisors (4933383107).

19886041021 is a wasteful number, since it uses less digits than its factorization.

19886041021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275412.

The product of its (nonzero) digits is 27648, while the sum is 40.

The spelling of 19886041021 in words is "nineteen billion, eight hundred eighty-six million, forty-one thousand, twenty-one".