19841021853 has 16 divisors (see below), whose sum is σ = 27312101376. Its totient is φ = 12798771120.

The previous prime is 19841021839. The next prime is 19841021867. The reversal of 19841021853 is 35812014891.

It is an interprime number because it is at equal distance from previous prime (19841021839) and next prime (19841021867).

It is not a de Polignac number, because 19841021853 - 2⁶ = 19841021789 is a prime.

It is a super-2 number, since 2×19841021853² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19841021803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 908326 + ... + 929912.

It is an arithmetic number, because the mean of its divisors is an integer number (1707006336).

Almost surely, 2^19841021853 is an apocalyptic number.

It is an amenable number.

19841021853 is a deficient number, since it is larger than the sum of its proper divisors (7471079523).

19841021853 is a wasteful number, since it uses less digits than its factorization.

19841021853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31504.

The product of its (nonzero) digits is 69120, while the sum is 42.

The spelling of 19841021853 in words is "nineteen billion, eight hundred forty-one million, twenty-one thousand, eight hundred fifty-three".